When Linda Mulholland and her husband started their own business, they decided to go for the whole enchilada. Actually, many enchiladas. Their Cocina DeLeon in the Galleria West shopping center on Bluemound Road in Brookfield fits into a small and uncommon dining industry niche - take and bake Mexican food. The Mulhollands specialize in gourmet enchiladas, offering 11 different varieties made in their commercial kitchen and sold frozen to customers.