Combine the mustard and oil in a small bowl. In a second bowl, mix together the bread crumbs, tarragon, parsley and pepper. Sprinkle the bread-crumb mixture onto a large sheet of wax paper. Brush one side of a lamb slice to coat it lightly with the mustard-oil mixture; set the slice mustard side down on the crumbs. Brush the second side with the mustard-oil mixture and turn the slice to coat it thoroughly with the crumbs. Repeat the process to coat the remaining slices of lamb.