To be considered a restaurant, an establishment shall meet the requirements of this section. The Board and the County Department of Health shall approve the sanitary facilities, running hot and cold water, equipment for the proper cleaning of dishes and kitchenware, and adequate number of toilets in the establishment. The establishment shall have one or more signs in front of the establishment that: designate “restaurant” or food and beverages sold; and do not advertise any other business. The establishment shall have sufficient food on the premises at all times for the regular serving of meals. An establishment that serves food and alcoholic beverages and has gross monthly receipts from the sale of food that average $1,500 or more may not be required to sell food in excess of one–half of the average monthly receipts from the sale of alcoholic beverages.