Biscuits with Sliced Ham and Apricot Preserves

Name: Biscuits with Sliced Ham and Apricot Preserves
Ingredients: 3 1/2 cups (17 1/2 oz./545 g) all-purpose flour, plus more for dusting; 2 1/2 tsp. baking powder; 1 tsp. kosher salt; 1 tsp. sugar; 1/4 tsp. baking soda; 16 Tbs. (2 sticks) (8 oz./250 g) cold unsalted butter, cut into 1/2-inch (12-mm) cubes, plus 2 Tbs. unsalted butter, melted; 1 cup (8 fl. oz./250 ml) cold buttermilk; Flaky sea salt; 1 lb. (500 g) country ham, thinly sliced; Apricot preserves for serving; Dijon mustard for serving