Barley Oat Biscuits

Name: Barley Oat Biscuits
Ingredients: 1/4 cup plus 2 tablespoons packed dark brown sugar; 2 ounces pecan halves (1/2 cup); 1 cup quick-cooking oats; 1/2 cup barley flour; 1/2 cup all-purpose flour, plus more for dusting; 1 1/4 teaspoons kosher salt; 10 tablespoons (1 1/4 sticks) cold unsalted butter, cut into pieces; 2 to 4 tablespoons ice water; 2 to 3 tablespoons heavy cream, as needed for brushing; 3 to 4 tablespoons granulated sugar, as needed, for sprinkling