Step 1

Preheat the oven to 450 degrees F.

Step 2

Whisk together the flour, the baking powder, the baking soda, the sugar, and the salt in a bowl.

Step 3

Cut in the cold butter with a pastry blender or a fork until coarse crumbs form.

Step 4

Stir the buttermilk into the flour mixture until just combined.

Step 5

Flour a worksurface well and turn the dough out onto it.

Step 6

Knead the dough lightly 3-4 times.

Step 7

Pat the dough into a 3/4-inch-thick rectangle.

Step 8

Cut the dough rectangle into 9 squares and transfer them to a baking sheet, placing them close together but not touching.

Step 9

Brush the dough squares with the melted butter.

Step 10

Bake the biscuits until golden brown, about 18-20 minutes.

Step 11

Transfer the biscuits from the oven and allow them to cool slightly, about 5 minutes.

Step 12

Cut the biscuits in half and add the ham.

Step 13

In a bowl, whisk together the apricot jam, the whole-grain mustard, and the Dijon mustard.

Step 14

Smear the apricot mustard over the ham slices.

Step 15

Serve the biscuits with the cheese and the lettuce.