Name: Rio Grande Rice and Black Beans
Ingredients: 1 medium onion, chopped; 1 tablespoon vegetable oil; 3 cups cooked rice; 1 16-ounce can black beans, rinsed and drained; 1 medium-size green pepper, roasted and chopped; 1 medium-size red pepper, roasted and chopped; 1 8-3/4-ounce can whole-kernel corn, drained; 1 tablespoon chili powder; 1/2 teaspoon oregano; 1/2 teaspoon salt; 1/8 teaspoon ground red pepper; 1 cup (4 ounces) shredded Cheddar cheese

Why it works: Beans and corn match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 1,211 recipes. Both carry 2,3-pentanedione, which smells butter, sweet. The science ↓

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

Beans + corntop 3% of all pairs

Smell alikestrong

Cooked together1,211 recipes

Shared aroma: 2,3-pentanedione (butter, sweet).
Rice + beanstop 4% of all pairs

Smell alikestrong

Cooked together1,017 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).
Rice + corntop 5% of all pairs

Smell alikestrong

Cooked together933 recipes

Shared aroma: 2-nonenal (fatty, green).
Pepper + oreganotop 5% of all pairs

Smell alikestrong

Cooked together3,449 recipes

Shared aroma: estragole (anise, licorice).
Beans + oreganotop 6% of all pairs

Smell alikestrong

Cooked together453 recipes

Shared aroma: hexyl acetate (fruity, apple).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Cooked rice: Forms the bulk of the dish and absorbs the flavor of the seasonings.
Black beans: Adds firm, meaty texture and earthy body to the mixture.
Onion: Softened in hot oil, it builds a sweet, savory base for the dish.
Whole-kernel corn: Adds pops of sweetness and a tender bite.
Green pepper: Roasting mellows its flavor and adds sweet, vegetable notes with a little crunch.
Cheddar cheese: Softens over the cool mixture, adding salty richness and fat.

The step that matters

Cook onion in oil over medium-high heat. Cooking the onion long enough softens it and develops sweetness through browning. Too little time leaves it raw and sharp, which would carry through the whole dish.

Swap the onion

How well each one fits the dish's main ingredients (rice, beans, pepper, corn, oregano, cheddar cheese):

Capsicumfits better
Tomatofits better
Potatofits better
Onionthe original

Fit is the average pairing score against rice, beans, pepper, corn, oregano, cheddar cheese. Candidates are from the same food group and used in at least 100 recipes.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.

Ingredient	Portion assumed	kcal
Rice	1 cup cooked (158g) white	206
Olive Oil	1 tbsp (14g)	119
Black Bean	1/2 cup canned (120g) drained	114
Cheddar Cheese	1 oz (28g)	113
Corn	1/2 cup kernels (82g)	77
Onion	1 medium (110g)	44
Bell Pepper	1 medium (119g)	31
Chili	1 tsp (2.7g)	8
Oregano	1 tsp dried (1.8g)	5
Salt	1 tsp (6g)	0

Rio Grande Rice and Black Beans