Cook the asparagus according to package directions; drain and keep warm. Spread mustard on one side of each slice  of toast. Place ham slices on bread. Arrange hot asparagus on top of ham. Toss together cheese, green onion, and pimiento. Sprinkle cheese mixture over asparagus. Broil sandwiches 5 inches from heat until the cheese melts, about 2 - 3 minutes. Makes 4