Why it works: Onion and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Scotch Haggis
Ingredients
Directions
Prepare
Thoroughly cleanse the sheep's stomach bag in hot water and salt.
Boil the sheep's pluck and tongues for 1 hour, then chop finely.
In a bowl, mix the chopped pluck, oatmeal, suet, parboiled onions, salt, and pepper thoroughly.
Add 1 pint of the stock to the mixture and fill the stomach bag halfway.
Cook and serve
Sew the bag closed with a needle and thread.
Place the bag in a pot of boiling water, pricking it with a needle as it swells to allow air to escape.
Boil for 3 hours, placing a plate beneath the bag to prevent sticking.
Serve hot in a napkin on a plate without garnish or gravy.
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 their aromas overlap, and how often cooks already put them together.
-
Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Liver + oniontop 15% of all pairsSmell alikelowCooked together1,420 recipes
Shared aroma: furaneol (caramel, strawberry).
-
Liver + peppertop 21% of all pairsSmell alikemoderateCooked together2,375 recipes
Shared aroma: 2-nonenal (fatty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Oatmeal
- Absorbs the stock and fat, giving the filling its crumbly, bound body.
- Suet
- Adds fat that keeps the filling moist and rich as it cooks.
- Sheep's pluck
- Provides the main meaty flavour and texture of the filling.
- Stock
- Adds moisture so the oatmeal softens and the filling stays tender.
- Spanish onions
- Add sweetness and aroma to the filling.
The step that matters
Pricking the bag as it swells. The filling expands and steam builds inside the bag as it boils. Without pricking to release air, the bag can burst, so the pricking matters.
Swap the onion
How well each one fits the dish's main ingredients (liver, pepper):
- Capsicumfits better
- Carrotfits better
- Mustardfits about as well
- Onionthe original
Fit is the average pairing score against liver, pepper. 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.
You might also like
The free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.
Tomato Soup526 recipes
Brown Bread461 recipes
Mutton Broth292 recipes
Yorkshire Pudding264 recipes