hazelnut chocolate thumbprint cookies

INGREDIENTS

• 1 almost-full cup (4 ounces) hazelnuts, toasted, skinned and cooled
• 2/3 cup sugar
• 2/3 cup matzo cake meal or 1 cup plus 1 tablespoon flour
• 1/4 teaspoon salt
• 1 stick (1/2 cup) unsalted butter, melted and cooled slightly
• 1 large egg, lightly beaten
• 1 teaspoon vanilla extract
• Chocolate (I used
• or “wafers”; 2 or 3 chocolate chips would also work)