Combine sour cream, mustard and honey; mix well. Spread on cut slices of bread. Arrange lettuce leaves on bottom half of bread. Spread coleslaw evenly over lettuce leaves. Top withroast beef and tomato. Close with top half of loaf. Wrap in aluminum foil. Rerigerate up to 4 hours. Carry to site in insulated cooler. To serve, cut into slices.