What You'll Need
For the Pastry Cream Filling:
3 cups milk
3/4 cup sugar
3 tablespoons all-purpose flour
3 tablespoons cornstarch
3/4 teaspoon salt
2 large eggs (room-temperature, beaten)
1 tablespoon butter (softened)
2 teaspoons vanilla
1 cup whipping cream (whipped to stiff peaks)
For the Cream Puff Dough (Pâte à Choux):
6 ounces butter
1 1/2 cups boiling water
1 1/2 cups all-purpose flour
1/2 teaspoon salt
6 large eggs (room-temperature)
For the Caramel:
1 1/2 cups sugar
1/2 cup light corn syrup
2/3 cup water
Make the Pastry Cream Filling
- Scald milk in medium saucepan. In a small bowl, whisk together sugar, flour, cornstarch, and salt. Gradually stir into scalded milk and reduce heat to medium-low.
- Add eggs and cook until thick, stirring constantly. Remove from heat, and mix in butter and vanilla. Place plastic wrap on the surface of the cream so a skin doesn't form and chill until cold. Make the cream puffs while filling is chilling. The whipped cream will be added after pastry cream chills.
- Make the Cream Puff Dough
- In a medium saucepan, melt 6 ounces butter in boiling water. Add flour and salt. Cook, stirring constantly with a wooden spoon until it forms a ball that won't separate. Remove from heat.
- Transfer to a mixing bowl or stand mixer. Add the 6 eggs, one at a time, beating well after each. The paste will separate as you add each egg, but with continued beating will smooth out.
- Bake the Cream Puffs
- Heat oven to 400 F. To form cream puffs, use a plain tip and pipe small, equal-sized balls of dough 2 inches apart on a parchment-lined pan. If the piped dough balls have peaks, use a pastry brush dipped in a little egg white to pat it smooth.
- Bake 35 to 40 minutes or until golden brown. Let cool completely.
- Fill the Puffs and Make the Cone Base
- Remove pastry cream from refrigerator and beat with a mixer until smooth. Fold in the whipped cream.
- Fill a piping bag fitted with a thin nozzle-type tip with the cream and plunge the tip into the side of each cooled cream puff shell and fill with pastry cream.
- Cover a medium-size Styrofoam cone with aluminum foil and place it on a cake circle that has been covered with aluminum foil and set aside.
Make the Caramel
- Place 1 1/2 cups sugar, corn syrup and 2/3 cup water in a small heavy saucepan and stir to blend ingredients.
- Place on high heat and cook until syrup turns light amber. DO NOT STIR during this time but wash down the sides of the pan with a pastry brush dipped in hot water about every 2 minutes.
- It will take 7 to 9 minutes for the caramel to cook. Watch closely at the end because the sugar can burn easily.
Assemble the Croquembouche
- When the caramel is light amber, remove from heat and wait for bubbles to disappear (about 3 to 4 minutes).
- Starting at the base of the foil-covered cone, dip flat end of filled cream puffs quickly in hot caramel (be careful not to burn your fingers) and apply it to the bottom of the cone. Repeat until the entire cone is covered.
Make the Optional Spun-Sugar Caramel
- If caramel is too cool, it can be rewarmed carefully over low heat.
- Using a fork, or spun sugar tool (or a whisk with the end cut off and the prongs spread apart), dip into caramel and move back and forth over a parchment-lined pan to form long, thin threads.
- Before the caramel has a chance to cool, pick it up to drape around the croquembouche. Continue for as much caramel draping as you would like.