Name: Spanish Potato Omelet with Romesco Sauce
Yield: Makes 8 to 10 servings
Ingredients: 1 large Spanish onion, thinly sliced; 4 medium russet potatoes, peeled, sliced 1/8-inch thick; 3/4 cup extra virgin olive oil; 8 large eggs; Kosher salt; 1 cup almonds, skins removed; 1 cup hazelnuts, skins removed; 1 slice white bread; 5 to 6 garlic cloves, peeled; 1 large red bell pepper, halved and seeded; 2 plum tomatoes, halved; 1 tablespoon sherry vinegar; 2 tablespoons flat-leaf parsley, chopped; 1/2 teaspoon smoked Spanish paprika; 1/4 cup extra virgin olive oil, plus more if needed; Kosher salt and freshly ground black pepper

Why it works: Almond and hazelnut match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 186 recipes. Both carry coumarin, which smells sweet, hay. 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.

Almond + hazelnuttop 1% of all pairs

Smell alikestrong

Cooked together186 recipes

Shared aroma: coumarin (sweet, hay).
Onion + garlictop 1% of all pairs

Smell alikestrong

Cooked together29,058 recipes

Shared aroma: furaneol (caramel, strawberry).
Olive + garlictop 2% of all pairs

Smell alikemoderate

Cooked together25,665 recipes

Shared aroma: linalool (floral, citrus).
Onion + potatotop 3% of all pairs

Smell alikemoderate

Cooked together9,023 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Potato + garlictop 4% of all pairs

Smell alikemoderate

Cooked together4,517 recipes

Shared aroma: furaneol (caramel, strawberry).

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

Swap the hazelnut

How well each one fits the dish's main ingredients (onion, potato, olive, egg, almond, bread, garlic):

Chickpeafits better
Sesamefits better
Beansfits better
Hazelnutthe original

Fit is the average pairing score against onion, potato, olive, egg, almond, bread, garlic. Candidates are from the same food group and used in at least 100 recipes.

Ingredient	Portion assumed	kcal
Potato	1 medium (173g) baked	161
Olive Oil	1 tbsp (14g)	119
White Bread	1 slice (30g) white	79
Egg	1 large egg (50g)	78
Onion	1 medium (110g)	44
Bell Pepper	1 medium (119g)	31
Plum	1 medium (66g)	30
Wine	2 tbsp cooking wine (30ml)	25
Tomato	1 medium (123g)	22
Almond	1 almond (1.2g)	7
Black Pepper	1 tsp ground (2.3g)	6
Garlic	1 clove (3g)	4
Vinegar	1 tbsp (15ml) distilled	3
Parsley	1 tbsp chopped fresh (3.8g)	1
Salt	1 tsp (6g)	0
Hazelnut	not in our table	0

Spanish Potato Omelet with Romesco Sauce