Why it works: Butter and milk match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 81,222 recipes mention both. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
The recipe
20 mini éclairsIngredients
Contains: egg, milk, wheat (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Method written by CompKitchen from the ingredient list. Not the original author's method, not kitchen-tested.
Heat the oven to 425°F (220°C) and line a baking sheet with parchment paper.
In a saucepan, bring the water, milk, butter pieces, granulated sugar and fine salt to a boil, stirring until the butter melts. Add a splash of water if the mixture is too thick later.
Remove from heat, add the flour all at once and stir vigorously until a smooth dough forms and pulls away from the pan, about 1 minute.
Let the dough cool for 5 minutes, then beat in the eggs one at a time until the dough is smooth and glossy.
Pipe 20 mini éclair shapes about 2 inches (5 cm) long onto the sheet. Bake 20 minutes at 425°F (220°C), then reduce the heat to 350°F (175°C) and bake 10 to 15 minutes more until firm and dry. Cool completely, then split each one along the side.
For the filling, whip the cold heavy cream with the vanilla extract and 1 tablespoon of the powdered sugar until soft peaks form. In another bowl, beat the cold mascarpone with 2 tablespoons Marsala and the remaining powdered sugar until smooth.
Fold the whipped cream into the mascarpone mixture. If it is too stiff, loosen with the 2 tablespoons heavy cream, a little at a time. Chill until ready to fill.
Stir the espresso powder into the remaining 2 tablespoons Marsala and a splash of hot water until dissolved. Brush a little onto the inside of each shell, then spoon or pipe the filling in.
Whisk the sifted powdered sugar with the cooled espresso mixture and a splash of hot water to a thick, spreadable glaze. Dip or spread the tops of the éclairs, then dust with cocoa powder. Chill briefly before serving.
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.
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Butter + milktop 3% of all pairsAroma overlapstrongMentioned together81,222 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Butter + cheesetop 3% of all pairsAroma overlapstrongMentioned together7,955 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Butter + creamtop 3% of all pairsAroma overlapstrongMentioned together41,494 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Milk + cheesetop 4% of all pairsAroma overlapstrongMentioned together4,424 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Butter + winetop 5% of all pairsAroma overlapmoderateMentioned together8,517 recipes
Shared aroma: 2-furfurylthiol (coffee, roasted).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
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