INGREDIENTS
1
Egg, large
1
Egg yolk, large
2 cups
All-purpose flour
1/4 cup
Cocoa powder, unsweetened Dutch-process
1/4 cup
Granulated sugar
1/2 tsp
Salt, coarse
1
Sanding sugar
1 tsp
Vanilla extract, pure
1 tsp
Espresso, good-quality instant powder
1/2 cup
Butter, unsalted
3 tbsp
Water