• Make-Ahead
• Vegetarian

Ingredients

1. 1/2 cup hazelnuts
2. 1 cup milk
3. 1 stick plus 1 tablespoon unsalted butter
4. 2 tablespoons Frangelico or other nut-flavored liqueur
5. 2 teaspoons sugar
6. 3/4 teaspoon salt
7. 1 cup all-purpose flour
8. 4 large eggs
9. 1 large egg yolk mixed with 2 tablespoons of water
10. 1/4 pound blue cheese, such as Maytag, at room temperature
11. 1/2 cup mascarpone
12. 1/2 cup heavy cream
13. Seedless red grapes, for serving

Directions

1. Preheat the oven to 375° and position racks in the upper and middle thirds. Line 2 large baking sheets with parchment paper. Spread the hazelnuts in a pie plate and toast for about 12 minutes, until the nuts are fragrant and the skins are blistered. Transfer the nuts to a clean kitchen towel and rub vigorously to remove the skins. Let the hazelnuts cool completely. Transfer the hazelnuts to a food processor and finely grind them.
2. In a large saucepan, combine the milk with the butter, Frangelico, sugar and salt and bring to a simmer over moderate heat. Remove from the heat. Add the flour and 1/4 cup plus 2 tablespoons of the ground hazelnuts and stir with a wooden spoon until a mass forms. Return the saucepan to moderate heat and cook the dough, stirring, for 1 minute. Transfer the dough to a medium bowl and let it cool for 2 minutes. Using an electric mixer, beat in the eggs one at a time, beating well between additions.
3. Transfer the dough to a pastry bag fitted with a 1/2-inch plain tip. Pipe 1-inch mounds of the dough onto the prepared baking sheets, about 1 inch apart. Brush the tops with the egg wash and sprinkle with the remaining ground hazelnuts. Bake for about 25 minutes, until the profiteroles are puffed and golden; shift the pans from top to bottom and front to back halfway through baking. Poke a hole in the side of each puff to release the steam. Let the puffs cool completely.
4. In a medium bowl, using an electric mixer, beat the blue cheese with the mascarpone and heavy cream at medium speed until firm and fluffy. Using a serrated knife, split each puff horizontally and remove any doughy centers with a spoon. Fill each puff with 1/2 tablespoon of the blue cheese cream and replace the tops. Transfer to a platter and serve with the grapes.

Make Ahead

The filling can be refrigerated for up to 4 hours. The baked puffs can be covered and stored at room temperature for up to 2 days. Recrisp in the oven before splitting, filling and serving.