Name: A Useful Dish for a Busy Day
Ingredients: 4 medium potatoes, sliced; 1 large Spanish onion, sliced; 2 medium tomatoes, sliced; Salt and pepper to taste; 4 mutton chops or slices of cold mutton; Cold water

Why it works: Potato and onion match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and 9,019 recipes mention both. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

The recipe

Oven, in the book's wordsA moderate oven

Ingredients

Directions

The book says “a moderate oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.

Layer sliced potatoes, onions, and tomatoes in a pie dish.
Sprinkle with salt and pepper to taste.
Add a layer of mutton chops or cold mutton slices.
Repeat layers of potatoes, onions, and tomatoes.
Fill the dish with cold water.
Bake at 350°F (175°C) for 2 hours.
Serve in the pie dish.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much aroma chemistry they share, and how many recipes mention both.

Potato + oniontop 2% of all pairs

Aroma overlapstrong

Mentioned together9,019 recipes

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

Aroma overlapstrong

Mentioned together2,797 recipes

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

Aroma overlapstrong

Mentioned together17,913 recipes

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

Aroma overlapstrong

Mentioned together20,622 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Potato + peppertop 5% of all pairs

Aroma overlapstrong

Mentioned together8,303 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

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

What each ingredient does

Potatoes: Form the bulk of the casserole and soften into a tender, starchy layer as they bake.
Mutton: Provides the main meat flavour and richness, with fat that enriches the surrounding juices.
Spanish onion: Adds sweetness and savoury depth as it softens during the long bake.
Tomatoes: Contribute acidity and moisture that blend into the cooking liquid.

Flavor stand-ins for the onion

How well each one fits the dish's main ingredients (potato, tomato, pepper, mutton):

Capsicumbetter flavor fit
Carrotbetter flavor fit
Asparagusabout as good a flavor fit
Onionthe original

Fit is the average pairing score against potato, tomato, pepper, mutton. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).

“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.