Ingredients:
- 1 cup (240ml) water
- ½ cup (115g) unsalted butter, cut into cubes
- ¼ teaspoon (1.5g) salt
- 1 cup (120g) all-purpose flour
- 4 large eggs
- 2 cups (475ml) whole milk
- ½ cup (100g) granulated sugar
- ¼ cup (30g) cornstarch
- Pinch of salt
- 4 large egg yolks
- 2 tablespoons (30g) unsalted butter
- 1 teaspoon (5ml) vanilla extract
- 8 ounces (225g) semi-sweet chocolate, finely chopped
- ½ cup (120ml) heavy cream
- 2 tablespoons (30g) unsalted butter
- 1 tablespoon (15ml) light corn syrup
Instructions:
- Combine water, butter, and salt in a saucepan. Bring to a boil.
- Remove from heat and quickly add flour. Stir vigorously until a smooth dough forms and pulls away from the sides of the pan.
- Cool the dough slightly (about 5 minutes).
- Gradually add the eggs, one at a time, beating well after each addition. The dough should be smooth and pipeable.
- Pipe the choux pastry onto prepared baking sheets.
- Bake until golden brown and puffed up. Let cool completely on a wire rack.
- Heat milk in a saucepan.
- Whisk together sugar, cornstarch, and salt in a bowl.
- Whisk egg yolks into the sugar mixture.
- Temper the egg yolk mixture with some of the hot milk, then pour everything back into the saucepan.
- Cook over medium heat, stirring constantly, until the custard thickens.
- Remove from heat and stir in butter and vanilla extract.
- Transfer to a bowl, cover with plastic wrap (pressing it directly onto the surface), and refrigerate until chilled.
- Combine chocolate, cream, butter, and corn syrup in a heatproof bowl.
- Microwave in 30-second intervals, stirring in between, until the chocolate is melted and the glaze is smooth and glossy.
- Cut a slit lengthwise in each cooled choux bun.
- Fill with the chilled vanilla custard.
- Dip the tops of the filled éclairs in the chocolate glaze.
- Place on a wire rack to allow the glaze to set.