Ham-Stuffed Biscuits With Mustard Butter

INGREDIENTS

• 1 (1/4-ounce) envelope active dry yeast
• 1/2 cup warm water (100째 to 110째)
• 2 cups buttermilk
• 5 1/2 cups all-purpose flour
• 1 1/2 tablespoons baking powder
• 1 1/2 teaspoons salt
• 1/2 teaspoon baking soda
• 1/4 cup sugar
• 3/4 cup shortening
• Mustard Butter
• 2 pounds thinly sliced cooked ham