USDA ingredient referenceUpdated August 22, 2026

Onions prepared for a sandwich in 7 Feast-indexed USDA foods

Calories, portions and nutrition →Onions, for use on a sandwich

Within Feast’s 3,850-record USDA FNDDS reference corpus, “Onions prepared for a sandwich” appears as a formulation input in 7 finished-food records. Their calories and nutrients describe those complete foods, not the input label by itself. Use the catalog to choose the closest finished food and open its exact FoodData Central citation.

Browse all 7 linked food records →

Exact nutrition reference, complete food catalog and source methodology

For calories, macros, portions, and household measures, use Onions, for use on a sandwich, the exact cited complete FNDDS profile. This page answers the separate formulation question: where USDA lists input code 89902040 across Feast’s reference corpus.

What the code means

One exact source label across 7 complete records.

Every occurrence collected here uses ingredient code 89902040 and the source description “Onions, for use on a sandwich.” The code is preserved exactly as it appears in the FNDDS input-food rows. It is not a FoodData Central FDC ID, so this page does not invent a standalone ingredient-record URL.

The strongest concentrations of linked records are currently Vegetable sandwiches/burgers (6), Meat and BBQ sandwiches (1). These are category counts within Feast’s selected 3,850-record corpus. They do not estimate how often the ingredient is eaten, how common it is in recipes generally, or its prevalence across every FNDDS release.

Collection-level interpretation

Grounded ways to understand this source label

These summaries describe the linked FNDDS records in this exact corpus. They do not estimate consumer frequency, market share, or the composition of a meal.

Typical listed-weight range

8.2%–9.2%

The middle half of linked records spans 1.1 percentage points from the 25th to the 75th percentile. This is more resistant to a single extreme record than the full minimum-to-maximum range.

Largest linked category

Vegetable sandwiches/burgers

6 of 7 linked records (86%) sit in this USDA category. The remainder span 1 other category.

Most populated share band

5% to under 15%

7 records (100%) fall in this band after repeated rows for code 89902040 are combined within each food.

Most frequent eligible co-input

Tomatoes, for use on a sandwich

It appears alongside code 89902040 in 7 linked records (100%). Co-occurrence describes database structure, not a required recipe.

Where USDA uses this input

Linked records by source-food category

Each record is counted once even if ingredient code 89902040 appears on more than one input row inside that formulation. The category grouping describes the complete linked foods, not a culinary rule about the ingredient.

USDA survey-food categories

Source-formulation evidence

How the share of listed input weight changes

Repeated rows for code 89902040 inside one food are combined before the percentage is calculated. The denominator is the sum of all positive-weight inputs listed for that USDA formulation.

All linked records, not just the extremes

Where the listed-weight shares fall

Each bar counts complete food records after repeated rows for ingredient code 89902040 have been combined.

Under 1%0 records
0 of 7
1% to under 5%0 records
0 of 7
5% to under 15%7 records
7 of 7
15% to under 30%0 records
0 of 7
30% to under 60%0 records
0 of 7
60% to 100%0 records
0 of 7

The role changes by food type

Median listed share in the largest USDA categories

Category medians summarize source-formulation shares, not nutrient content or consumption frequency.

Listed-weight share distribution across the largest complete-food categories
Complete-food category	Records	Median	Middle 50%	Observed span
Vegetable sandwiches/burgers	6	8.2%	8.2%–8.9%	7%–9.2%

What the spread can tell you

In this collection, “Onions, for use on a sandwich” ranges from 7% to 10% of listed source-input weight, with a median of 8.2%. That variation can help distinguish a food where the input is a small supporting component from a record where it makes up much more of the standardized source formulation.

The spread remains descriptive. It does not show uncertainty around a single recipe, and a high source-weight share does not automatically mean the food supplies more of any particular nutrient. To compare nutrients, use the complete linked records below.

Verified consumer reference

Household measures and per-100-gram nutrition for Onions, for use on a sandwich

The values here come from Onions, for use on a sandwich, the exact complete FNDDS food cited as USDA FoodData Central record 2710252. Household totals are calculated only from gram weights USDA lists for that same record.

They are not an average of this ingredient collection, and they do not transfer automatically to a different product, recipe, preparation, or portion.

The complete FNDDS record's food code exactly matches source-input code 89902040.

Compare complete food records

Nutrient span across the linked foods

Every value in this table describes an entire USDA survey-food record per 100 grams. The values are not the nutrient content of ingredient code 89902040, and differences cannot be attributed to this one input.

Nutrient span across complete food records linked to this source ingredient code
Whole-record nutrient	Observed minimum	Middle 50%	Median	Observed maximum	Linked records
Caloriesper 100 g of the complete food	119 kcal	133–172 kcal	147 kcal	265 kcal	7
Proteinper 100 g of the complete food	3.9 g	5–6.3 g	5.8 g	11.2 g	7
Carbohydrateper 100 g of the complete food	18.4 g	19.2–20.8 g	19.7 g	27 g	7
Total fatper 100 g of the complete food	2.1 g	3.7–6.7 g	5.2 g	14.8 g	7
Dietary fiberper 100 g of the complete food	1 g	1.5–2.5 g	1.8 g	2.7 g	7
Sodiumper 100 g of the complete food	323 mg	365–445 mg	374 mg	528 mg	7

The minimum and maximum preserve the complete observed span. The median is the middle linked-record value, not a prediction for a meal and not an ingredient-specific nutrient estimate.

Complete linked catalog

All 7 Feast-indexed food records that list code 89902040

This is the complete qualifying-corpus catalog, not a hand-picked sample. Search by food name or USDA category, then open a profile for household portions, Feast’s 21-nutrient panel, formulation details, and its exact FDC citation.

Filter linked records

7 records shown

Complete USDA food-record catalog linked to this source ingredient code
Linked USDA food record	USDA category	Formulation	Listed input weight	Weight share	Calories	Protein	Sodium	Citation
Falafel sandwich	Vegetable sandwiches/burgers	7 input rows	15 g	7%	265 kcal	6.2 g	359 mg	FDC 2707483 ↗
Gyro sandwich	Meat and BBQ sandwiches	6 input rows	10 g	10%	184 kcal	11.2 g	323 mg	FDC 2706962 ↗
Vegetable sandwich on wheat	Vegetable sandwiches/burgers	9 input rows	15 g	9.2%	119 kcal	4.7 g	370 mg	FDC 2709134 ↗
Vegetable sandwich on wheat, with cheese	Vegetable sandwiches/burgers	10 input rows	15 g	8.2%	146 kcal	6.5 g	443 mg	FDC 2709135 ↗
Vegetable sandwich on white	Vegetable sandwiches/burgers	9 input rows	15 g	9.2%	120 kcal	3.9 g	374 mg	FDC 2709132 ↗
Vegetable sandwich on white, with cheese	Vegetable sandwiches/burgers	10 input rows	15 g	8.2%	147 kcal	5.8 g	446 mg	FDC 2709133 ↗
Vegetable sandwich wrap	Vegetable sandwiches/burgers	10 input rows	15 g	8.2%	160 kcal	5.4 g	528 mg	FDC 2709136 ↗

Decision support from the exact records on this page

Turn source data into a better next decision

These conclusions and reading paths are computed from 8 exact records behind Onions, for use on a sandwich (USDA input 89902040). Links are chosen by record identity, controlled contrast, formulation input, nutrient spread, or serving context—not by loose keyword similarity.

Equal-weight result

Vegetable sandwich wrap is higher in sodium per 100 g

Vegetable sandwich wrap reports 528 mg versus 1 mg for Onions, for use on a sandwich: a 527 mg difference when both are normalized to 100 g.

Inspect the underlying evidence

The denominator changes the answer

Vegetable sandwich wrap is denser; Vegetable sandwich on white, with cheese is higher in its source amount

Vegetable sandwich wrap reports 160 kcal per 100 g and 264 kcal in USDA source amount (165 g). Vegetable sandwich on white, with cheese reports a lower 147 kcal per 100 g but a higher 272 kcal in USDA source amount (185 g).

Record identity is part of the estimate

Distinguish “Vegetable sandwich wrap” from “Onions, for use on a sandwich”

These are separate USDA records with separate formulations or survey descriptions. Match preparation, additions, and the named household amount before borrowing either record’s nutrients.

Inspect the underlying evidence

Contextual knowledge graph

Follow the relationship that matches your question

For Onions, for use on a sandwich (USDA input 89902040), each path states why the destination belongs here, so you can distinguish a true evidentiary connection from a merely similar label.

Best next guide for this exact record Vegetable sandwich on wheat

Vegetable sandwich on wheat and Vegetable sandwich on wheat, with cheese are explicitly linked in this guide, which separates direct name matches from contextual variants.

Follow this evidence path Best next guide for this exact record Vegetable sandwich on white

Vegetable sandwich on white and Vegetable sandwich on white, with cheese are explicitly linked in this guide, which separates direct name matches from contextual variants.

Follow this evidence path 6 context records in this source topic Vegetable sandwiches/burgers

Vegetable sandwich wrap and Falafel sandwich belong to this USDA source-category collection. Its displayed ranges and complete exact-record catalog provide the peer set for a manual comparison; the destination does not preselect this page’s record.

Follow this evidence path A formulation detail that separates records Cucumber, for use on a sandwich

USDA input 89902010 appears in 6 of 8 context records; its summed listed input weight spans 10–10 g across those source formulations. These are source-formulation input weights, not plated or serving weights. Follow the code to inspect every represented occurrence.

Follow this evidence path A formulation detail that separates records Lettuce, for use on a sandwich

USDA input 89902020 appears in 6 of 8 context records; its summed listed input weight spans 8–8 g across those source formulations. These are source-formulation input weights, not plated or serving weights. Follow the code to inspect every represented occurrence.

Follow this evidence path Put the observed spread in corpus context Sodium: density and serving context

In this page’s records, sodium runs from 1 mg in Onions, for use on a sandwich to 528 mg in Vegetable sandwich wrap, all per 100 g.

Follow this evidence path Put the observed spread in corpus context Protein: density and serving context

In this page’s records, protein runs from 0.9 g in Onions, for use on a sandwich to 11.2 g in Gyro sandwich, all per 100 g.

Follow this evidence path

Method and provenance

How this ingredient-centered page was calculated

Feast begins with its pinned 3,850-record USDA FoodData Central Survey Foods reference corpus for FNDDS 2021–2023. Each exact food profile retains its FDC identifier, source-food description, nutrient values, household measures, and positive-weight input-food rows. This page groups those input rows by the exact ingredient code 89902040; it does not merge similar-looking ingredient names or infer synonyms.

The distinct-record count deduplicates by FDC food record. When the same code is listed more than once inside one source formulation, its input weights are added before the listed-weight share is calculated. Category counts also count each food once. The 25th percentile, median, and 75th percentile use the sorted one-share-per-food values with linear interpolation between adjacent ranks when a percentile falls between two records.

USDA’s current FNDDS documentation explains that many nutrient profiles are generated with calculation recipes designed to represent multiple variants, and that their input codes are not necessarily the exact ingredients in a retail product or an ingredient declaration. It also documents moisture and nutrient-retention adjustments. Feast therefore treats these rows as transparent source-calculation evidence—not as a reverse-engineered recipe.

The complete-food nutrient table uses each linked record’s available published per-100-gram values so the denominator remains consistent; its middle-50% ranges use the same interpolated percentile method. It is presented for record selection and comparison only. No nutrient value is reassigned to the ingredient, no causal effect is inferred, and no “healthy” score is manufactured from the collection.

How to apply the evidence to a meal

Use the ingredient as a discovery clue. Compare the linked record names, food categories, preparation wording, source formulation, and portion measures. If a close record exists, its complete profile can provide a defensible reference estimate. If the meal differs materially in cooking fat, sauce, ingredient ratios, or portion size, keep looking or use recipe weights, a package label, or an editable photo estimate instead.

These pages are educational source indexes. They do not provide medical advice, personalized nutrient targets, food-safety guidance, or a recipe. If a clinician has given you individualized dietary instructions, follow that guidance and use the most specific current source available for the food you actually consumed.