Name: Bread Crust
Ingredients: 1 penny roll; milk (for sweets); gravy (for savouries); sugar (for sweets); salt (for savouries); grated crumbs; eggs

Why it works: Milk and egg are a kitchen classic. They rank in the top 18% of all ingredient pairs, and cooks put them together in 88,785 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓

Bread Crust

Ingredients

Directions

Prepare the roll

Scrape the inside out of the penny roll.
Soak the roll in milk if filling with sweets.
Soak the roll in gravy if filling with savouries.
For sweets, sprinkle with sugar.
For savouries, sprinkle with salt.

Fill and bake

Add a few grated crumbs and eggs to the filling.
Bake until golden.

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 their aromas overlap, and how often cooks already put them together.

Milk + eggtop 18% of all pairs

Smell alikemoderate

Cooked together88,785 recipes

Shared aroma: 2-nonenal (fatty, green).
Milk + sugartop 18% of all pairs

Smell alikelow

Cooked together77,875 recipes

Shared aroma: 2-nonenal (fatty, green).
Sugar + eggtop 21% of all pairs

Smell alikemoderate

Cooked together122,807 recipes

Shared aroma: 2-nonenal (fatty, green).

Milk and sugar barely smell alike, yet cooks put them together in 77,875 recipes: they work on texture and structure more than aroma.

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

What each ingredient does

Penny roll: Forms the hollow shell that holds the filling and soaks up liquid to become soft.
Milk: Adds moisture and softness to the sweet filling.
Gravy: Adds moisture and savoury flavour to the savoury filling.
Sugar: Adds sweetness to the sweet version.
Eggs: Bind the filling and set as it bakes, giving it structure.
Grated crumbs: Absorb moisture and give the filling body.

“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.