Croquembouche (クロカンブッシュ, Kurokanbusshu)

Ingredients

Equipment Needed

• •Piping bags with round tips
• •Heavy saucepan
• •Wooden spoon
• •Parchment paper
• •Wire rack
• •Candy thermometer, optional
• •Metal croquembouche cone, optional, or a parchment guide circle on a plate

Instructions

1. 1

   Make the paste

   Heat the water, milk, butter, sugar, and salt in a saucepan until the butter melts and the liquid reaches a full boil. Add the sifted flour all at once and stir hard with a wooden spoon. The flour must meet the hot liquid together, not by timid spoonfuls, so it gelatinizes evenly and forms one paste instead of lumps.

2. 2

   Dry the dough

   Keep the pan over medium heat and stir for 2 to 3 minutes, pressing and turning the dough until it pulls cleanly from the sides and leaves a thin film on the bottom. This drying matters. The dough must lose enough water to accept the eggs, but keep enough moisture to make steam in the oven. That steam is what lifts the shell and leaves it hollow.

3. 3

   Work in eggs

   Move the dough to a bowl and let it cool for 3 minutes, just so it no longer cooks the eggs on contact. Beat in the eggs a little at a time. Stop when the dough turns glossy and drops from the spoon in a thick ribbon that bends into a V. You may not need every drop, because flour, weather, and egg size all have their own opinions.

4. 4

   Pipe the puffs

   Heat the oven to 200 C. Pipe small mounds, about 3cm wide, onto a parchment-lined tray, leaving space between them. Smooth any points with a damp fingertip so they don't burn before the puff has set. Small puffs build a steadier tower than large ones, and they eat more gracefully at a celebration table.

5. 5

   Bake until dry

   Bake for 15 minutes at 200 C, then lower to 180 C and bake 15 to 20 minutes more, until the puffs are deeply golden, light in the hand, and dry at the seams. Don't open the oven early. The shell must set before the steam escapes, or the puff collapses like a paper lantern in the rain.

6. 6

   Cook the custard

   Warm the milk with the vanilla until fragrant. In a bowl, whisk the yolks, sugar, and flour or cornstarch until pale, then whisk in the hot milk slowly. Return everything to the pan and cook over medium heat, whisking constantly, until it thickens and bubbles for one full minute. That minute cooks out the raw starch taste and gives the cream enough body to sit inside the shell.

7. 7

   Cool the cream

   Take the custard off the heat, whisk in the butter, and spread it in a shallow tray. Press plastic wrap directly onto the surface and chill completely. Fold in the whipped cream once cold. If the custard is warm, the cream melts and the filling slackens, and there is no dignity in a leaking puff.

8. 8

   Fill the shells

   Pierce the underside of each cooled puff with a small piping tip and pipe in the cream until the puff feels heavier but not swollen. The shell must be fully cool first, because trapped warmth turns crisp pastry damp from the inside. Fill gently. A puff should be generous, not bursting.

9. 9

   Cook the caramel

   Put the sugar, water, and mizuame or corn syrup, if using, in a clean saucepan. Cook without stirring until the syrup turns clear amber. Swirl the pan only if the color is uneven. Stirring throws sugar crystals onto the side of the pan, and crystals turn smooth caramel grainy. When it reaches amber, set the pan briefly in cold water to stop the cooking.

10. 10

    Build the tower

    Dip the side or base of each puff lightly in caramel and set them in a tight ring on a parchment-lined plate or low cake board. Build upward in smaller rings, leaning each puff slightly inward. Work slowly and keep the tower narrow. Caramel sets fast, which is both the nuisance and the blessing: it gives you very little time to fuss, then holds the work for you.

11. 11

    Finish and serve

    If the caramel hardens in the pan, warm it gently until fluid again. Finish with a few fine caramel threads or a light dusting of powdered sugar. Serve the same day, ideally within 3 hours, while the shells still have their clean bite and the cream is cold.

Chef Tips

• •Make one or two extra puffs. A tower forgives a missing piece more easily than a cracked one placed where everyone can see it.
• •Caramel is not the place for nervous fingers. Keep a bowl of cold water nearby in case of a burn, use tongs if you like, and never touch hot sugar to test it. It clings.
• •If the kitchen is humid, assemble close to serving. Caramel drinks moisture from the air, and the tower loses its crisp shine sooner than you think.
• •A metal cone mold is helpful but not required. For a small home tower, a parchment circle marked on the plate and a steady inward lean will do the work.

Advance Preparation

• •Bake the empty choux shells up to 1 day ahead. Keep them uncovered at room temperature once fully cool, then refresh in a 160 C oven for 5 minutes and cool again before filling.
• •The custard cream can be made 1 day ahead and refrigerated with wrap pressed directly against the surface.
• •Fill and assemble the tower the day it is served. Caramel and cream are both happiest when they don't wait long.

Frequently Asked Questions

Nutrition Information

1 serving (about 200g)