French Éclair: Choux Pastry, Custard Filling, and Chocolate Glaze

A proper éclair requires three separate preparations executed in sequence: choux pastry, crème pâtissière, and chocolate ganache glaze. The choux dough is cooked on the stovetop at 250°F until a skin forms on the bottom of the pan, then piped into 5-inch lengths and baked at 425°F for the first 10 minutes (to puff) before reducing to 375°F for another 15 minutes (to dry the interior). Underbaked choux collapses; overbaked choux cracks.

The pastry must sound hollow when tapped to confirm it is fully dried through.

Making Choux Pastry with Proper Hydration

Choux pastry is cooked twice: first on the stove to form a dough, and then in the oven to puff and set. I bring 250 milliliters of water, 100 grams of unsalted butter cut into small pieces, 1 teaspoon of sugar, and half a teaspoon of salt to a boil in a medium saucepan.

Once the butter is fully melted and the mixture is at a rolling boil, I remove the pan from the heat and add 150 grams of all-purpose flour all at once, stirring vigorously with a wooden spoon. The flour absorbs the liquid rapidly and forms a thick paste that pulls away from the sides of the pan. I return the pan to low heat and cook the dough for 2 minutes, stirring constantly, to evaporate excess moisture.

This cooking step is critical; undercooked dough produces choux that does not puff properly in the oven.

Incorporating Eggs for the Right Consistency

I transfer the dough to a stand mixer and let it cool for 5 minutes. Then I add 4 large eggs, one at a time, mixing on medium speed after each addition until the egg is fully absorbed. The dough goes through a dramatic transformation with each egg: it separates and looks curdled before coming back together into a smooth, glossy paste.

After all four eggs are incorporated, the dough should be thick enough to hold its shape when piped but soft enough to flow slowly when the bowl is tilted. I test the consistency by drawing a line through the dough with my finger; the line should hold for about 3 seconds before the dough flows back together. If the dough is too stiff, I add a fifth egg, beaten, one tablespoon at a time until the correct consistency is reached.

Piping and Baking for Maximum Rise

I transfer the dough to a piping bag fitted with a 1-centimeter plain tip and pipe 12-centimeter lines onto a parchment-lined sheet pan, spacing them about 5 centimeters apart. I dip my finger in water and smooth any peaks or tails on the surface of each piped line, which prevents them from burning in the oven. I bake at 200 degrees Celsius for 25 to 30 minutes.

During the first 15 minutes, I do not open the oven door, because the steam generated by the high-moisture dough is what causes the pastry to puff. After 15 minutes, I reduce the temperature to 180 degrees and continue baking until the eclairs are deep golden brown and feel light and hollow when lifted. I turn off the oven and let them cool inside with the door slightly ajar for 10 minutes, which dries out the interior and prevents sogginess.

Preparing Crème Pâtissière

The filling is a classic pastry cream, or crème pâtissière. I heat 500 milliliters of whole milk with 1 vanilla bean, split and scraped, in a saucepan until it just begins to simmer. In a separate bowl, I whisk together 4 egg yolks and 100 grams of sugar until the mixture is pale and thick, about 2 minutes. I sift in 40 grams of cornstarch and whisk until smooth.

I pour about one-third of the hot milk into the egg yolk mixture, whisking constantly to temper the eggs, then return the entire mixture to the saucepan. I cook over medium heat, whisking constantly, until the pastry cream thickens and comes to a boil. I boil it for 1 minute to fully cook out the starch, then remove it from the heat and stir in 30 grams of butter.

I press a piece of plastic wrap directly onto the surface of the pastry cream and refrigerate it for at least 2 hours until completely cold and set.

Glazing and Assembly

For the chocolate glaze, I heat 150 milliliters of heavy cream until it simmers, then pour it over 150 grams of chopped dark chocolate, 60 percent cacao. I let it stand for 2 minutes, then stir from the center outward until the ganache is smooth and glossy. I let it cool to about 30 degrees Celsius, which is thick enough to coat the eclairs without running off the sides.

I fill the cooled eclairs by poking three holes in the bottom of each one with a skewer and piping the pastry cream in until it is full. Then I dip the top of each eclair into the chocolate glaze, pulling it straight up to let the excess drip off. The eclairs should be refrigerated for 30 minutes to set the glaze, then served within 4 hours for the best contrast between the crisp shell and the creamy filling.

Homemade eclairs are worth every minute of effort. The choux pastry freezes well, so you can prepare shells in advance and fill them when needed. Master the basic recipe first, then experiment with different fillings and glazes. Once you nail the technique, you will never go back to bakery versions.