Why it works: Sauce and ketchup match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 1,099 recipes. Both carry ethanol, which smells alcoholic, ethereal. The science ↓
Pizzaburgers
6 sandwichesIngredients
Directions
Make the filling
Brown the onion with the meat.
Drain off the fat.
Add the tomato sauce, ketchup, Parmesan and the seasonings.
Simmer this mix for 20 minutes.
Assemble and bake
Divide the meat between the bottom halves of the rolls.
Put two slices of mozzarella on each sandwich.
Add the tops, wrap the sandwiches in aluminum foil and bake for 15 minutes at 350 degrees.
Nutrition, whole recipe (rough)
What these numbers assume: 9 portions
| Ingredient | Portion assumed | kcal |
|---|---|---|
| Beef | 100g cooked | 250 |
| Chicken | 100g cooked | 165 |
| Parmesan Cheese | 1 oz (28g) | 110 |
| Mozzarella Cheese | 1 oz (28g) | 85 |
| Onion | 1 medium (110g) | 44 |
| Fennel | 1/2 bulb (87g) | 27 |
| Tomato | 1 medium (123g) | 22 |
| Oregano | 1 tsp dried (1.8g) | 5 |
| Garlic | 1 clove (3g) | 4 |
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.
-
Sauce + ketchuptop 1% of all pairsSmell alikestrongCooked together1,099 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Onion + garlictop 1% of all pairsSmell alikestrongCooked together29,058 recipes
Shared aroma: furaneol (caramel, strawberry).
-
Tomato + garlictop 3% of all pairsSmell alikemoderateCooked together14,076 recipes
Shared aroma: furaneol (caramel, strawberry).
-
Beef + oniontop 7% of all pairsSmell alikemoderateCooked together17,092 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Tomato + fenneltop 7% of all pairsSmell alikemoderateCooked together551 recipes
Shared aroma: beta-phellandrene (minty, terpene).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Ground beef
- Provides the savory meat base that the sauce coats and the rolls hold.
- Tomato sauce
- Adds moisture and acidity that season and loosen the meat filling.
- Ketchup
- Contributes sweetness and tang, rounding out the sauce.
- Parmesan cheese
- Adds salty, savory depth to the filling.
- Mozzarella cheese
- Melts over the filling to create a stretchy, gooey layer.
- Kaiser rolls
- Hold the filling and absorb juices while baking inside the foil.
The step that matters
Simmer the meat mixture after draining the fat. Simmering lets the tomato sauce and seasonings reduce and meld into the meat, so the filling is thick rather than watery. Excess liquid would soak the rolls and make the sandwich soggy.
Swap the fennel
How well each one fits the dish's main ingredients (beef, onion, tomato, sauce, ketchup, parmesan cheese, garlic):
- Celeryfits better
- Capersfits better
- Basilfits better
- Fennelthe original
Fit is the average pairing score against beef, onion, tomato, sauce, ketchup, parmesan cheese, garlic. 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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