Eclair

Make the pastry cream (first, so it can chill)

1. Heat the milk. In a medium saucepan, warm the milk with 1/4 cup of the sugar over medium heat until steaming and just starting to bubble at the edges. Do not let it fully boil.

2. Whisk the yolks. In a bowl, whisk egg yolks with the remaining 1/4 cup sugar, cornstarch, and salt until smooth and pale.

3. Temper, then thicken. Slowly whisk about 1/2 cup of the hot milk into the yolk mixture to warm it up. Pour everything back into the saucepan. Cook over medium heat, whisking constantly, until it thickens and reaches a gentle boil. Once it starts bubbling, keep it boiling while whisking for about 30 seconds, about 2 to 4 minutes total. If you use a thermometer, aim for about 175°F to 185°F.

4. Finish and chill. Remove from heat and whisk in butter and vanilla. Pour into a shallow dish. Press plastic wrap directly onto the surface (this prevents a skin). Refrigerate until cold and thick, at least 1 hour.

Bake the shells

1. Prep. Preheat oven to 425°F. Line 2 baking sheets with parchment. For straighter eclairs, draw 4 to 5 inch guide lines on the back of the parchment, then flip it over so the ink is underneath.

2. Simmer the base. In a saucepan over medium heat, combine water, milk, butter, sugar, and salt. Bring to a simmer (just bubbling) and make sure the butter is fully melted.

3. Add flour all at once. Remove from heat, add flour, and stir hard until no dry flour remains.

4. Dry the dough. Return the pan to medium heat and keep stirring for 1 to 2 minutes until the dough forms a smooth ball and leaves a thin film on the bottom of the pan.

5. Cool briefly. Move dough to a mixing bowl and let it cool for about 3 minutes. You want it warm, not egg-scrambling hot.

6. Add eggs. Beat in eggs one at a time, mixing until each is fully absorbed. At first it will look separated. Keep going. The final dough should be glossy and thick, and when you lift the spoon it should fall in a smooth V shape.

7. Pipe. Transfer dough to a piping bag with a large round tip. Pipe 10 to 12 lines about 4 to 5 inches long on the sheets, leaving space for puffing. Hold the bag at about a 45° angle and keep steady pressure for cleaner lines. Smooth any sharp peaks with a damp fingertip.

8. Optional egg wash. Lightly brush with egg wash for a shinier finish.

9. Bake, then lower heat. Bake at 425°F for 10 minutes, then without opening the oven, reduce to 350°F and bake 18 to 22 minutes until deep golden and firm. (Some ovens vent heat hard when they change temperature. If yours does, you may need a few extra minutes.)

10. Vent and dry. Working quickly, pull the tray out just enough to poke a small hole in the end of each shell with a skewer (or poke the bottoms). This lets steam escape so they stay hollow. Slide the tray back in, turn the oven off, crack the door, and let the shells sit for 10 minutes. If they still feel a little soft, close the door and dry them for another 5 to 10 minutes at 325°F to 350°F.

11. Cool. Transfer to a rack to cool completely. Trim uneven ends if you want them extra tidy.

Fill and glaze

1. Loosen the pastry cream. Stir the chilled pastry cream until smooth. Spoon it into a piping bag fitted with a small round tip.

2. Fill the eclairs. Poke 2 to 3 small holes in the bottom of each shell with a skewer or the piping tip. Pipe pastry cream in until the eclair feels heavy and you see a little cream trying to peek out.

3. Make glaze. Put chopped chocolate in a bowl. Heat heavy cream until it just simmers, then pour over chocolate. Let sit 2 minutes, then stir until glossy. Stir in butter and a pinch of salt.

4. Dip. Dip the top of each eclair into the glaze, let the excess drip off, then place on a rack to set for about 15 minutes. This glaze sets with a soft, sliceable finish, not a hard snap like fondant.

5. Serve. Serve right away or refrigerate until ready. For the best texture, let chilled eclairs sit at room temp for 10 minutes before eating.

Tips and Variations

• Do not open the oven early. Steam is your lift. Opening the door too soon can collapse the shells.
• Doneness check: Deep golden, firm, and light for their size. If you split one, there should be no wet dough inside.
• Flavor swaps: Add 1 teaspoon instant espresso powder to the pastry cream, or fold in 1/2 cup lightly whipped cream once the custard is cold for a lighter crème diplomate vibe.
• Glaze options: Use dark chocolate for a more grown-up bite, or add 1 tablespoon corn syrup to the glaze for extra shine and a slightly softer set.
• Make-ahead plan: Bake shells (freeze), make pastry cream (up to 3 days), then fill and glaze the day you want to serve.