1/2 cup water
1/2 cup milk
1/2 cup butter
1 cup flour
4 eggs
1 cup heavy cream
2 tbsp instant coffee
1/4 cup sugar
1 cup powdered sugar
2 tbsp brewed coffee
Boil the milk, butter, and water to make the choux pastry. Add the flour and whisk. After letting cool, pipe onto a baking sheet and add the eggs one at a time. For 20–25 minutes, bake at 400°F (200°C).
Cream should be whipped with sugar and instant coffee until firm peaks form. Fill chilled éclairs.
Blend coffee grounds and powdered sugar, then pour the mixture over the éclairs.