Why it works: Butter and bread are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 27,232 recipes. Both carry delta-decalactone, which smells sweet, creamy. The science ↓
Kaaszebras
Ingredients
Directions
Make the spread
Beat butter until soft.
Add egg yolks, salt, pepper, Worcestershire sauce, cheese, and mustard; mix until smooth.
Assemble and chill
Spread the mixture thickly on a slice of bread.
Place another slice of bread on top, add another layer of spread, and then add the final slice of bread on top.
Wrap the sandwich in aluminum foil and chill for at least 2½ hours.
Cut and serve
Cut into ladyfinger‑sized strips.
Nutrition, whole recipe (rough)
Counts 9 of 10 ingredients. The other 1 aren't in our nutrition table and add nothing above, so the real totals are higher.
What these numbers assume: 9 portions
| Ingredient | Portion assumed | kcal |
|---|---|---|
| Flour | 1 cup (125g) all-purpose | 455 |
| Cheese | 1 oz (28g) cheddar | 113 |
| Parmesan Cheese | 1 oz (28g) | 110 |
| Butter | 1 tbsp (14g) | 102 |
| Egg | 1 large egg (50g) | 78 |
| Soy Sauce | 1 tbsp (15ml) | 9 |
| Black Pepper | 1 tsp ground (2.3g) | 6 |
| Mustard | 1 tsp (5g) yellow | 3 |
| Salt | 1 tsp (6g) | 0 |
| Gouda | not in our table | 0 |
One typical portion per ingredient; the recipe's quantities are not counted. A rough guide only, not for medical or dietary planning.
Steps grouped into stages for easier reading; the method is the source's own.
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.
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Butter + breadtop 7% of all pairsSmell alikemoderateCooked together27,232 recipes
Shared aroma: delta-decalactone (sweet, creamy).
-
Butter + parmesan cheesetop 9% of all pairsSmell alikemoderateCooked together4,163 recipes
Shared aroma: guaiacol (smoky, sweet).
-
Pepper + mustardtop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Sauce + mustardtop 13% of all pairsSmell alikemoderateCooked together2,120 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Egg + breadtop 13% of all pairsSmell alikemoderateCooked together22,662 recipes
Shared aroma: (e)-2-octenal (fatty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Butter
- Softened butter gives the spread a creamy, spreadable body and rich flavor.
- Egg yolks
- Cooked yolks bind the spread and add richness and a smooth, thick texture.
- Parmesan cheese or gouda cheese
- Cheese adds salty, savory flavor and helps the spread set firm when chilled.
- Dijon mustard
- Mustard adds sharp acidity that cuts through the richness of butter and yolks.
- Pumpernickel bread
- Dense, dark bread holds the thick spread and provides a hearty, slightly sweet base.
The step that matters
Chilling the wrapped sandwich. Chilling firms the butter and cheese so the spread sets and the layers hold together when cut. Cutting too early can smear the filling and crush the bread.
Swap the mustard
How well each one fits the dish's main ingredients (butter, egg, pepper, sauce, parmesan cheese, bread):
- Asparagusfits better
- Capsicumfits better
- Tomatofits better
- Mustardthe original
Fit is the average pairing score against butter, egg, pepper, sauce, parmesan cheese, bread. 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.
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