Grapefruit Poppy Seed Buttons

Check 2 cups all-purpose flour, spooned and leveled

Check ¼ cup poppy seeds

Check ½ teaspoon fine salt

Check pinch ground cloves

Check 1 cup (2 sticks) unsalted butter, softened

Check ⅓ cup granulated sugar

Check 1⅓ cup confectioners’ sugar

Check 2 tablespoons finely grated grapefruit zest (from 1 grapefruit), plus 2 tablespoons grapefruit juice

Check 1 large egg yolk

Check 1 teaspoon pure vanilla extract