Combine dry ingredients and herbs. Cut in butter. Beat egg and mix with dressing, then pour over dry ingredients, mixing with a fork. Turn dough onto floured board and knead briefly. Pat out to about 1/2 to 3/4 inch thick. Cut out with 2 inch circle cutter. Make 12 biscuits. Place on an ungreased baking sheet and bake at 350 degrees F. for 12 minutes or until golden brown.
While biscuits are cooking, combine pork, beef and pepper in a bowl. Mix well but do not overwork. Shape into patties about 2 1/2 inches round. Heat a grill pan and grill the burgers for 4 to 5 minutes on each side.
Split the biscuits and add patties with a bit of mustard to each one, add some of the remaining shredded Parmesan cheese and top with half of a lettuce leaf. Makes 12 sliders.