The Mexican-cuisine restaurant in Asheville with a “secret” tequila window now has a speakeasy-style taco door with a window to spice up dining out on Taco Tuesday and any other day of the week. With a simple ring of the bell or tap of a lion-faced knocker, customers alert the kitchen staff to place orders for tacos, quesadillas, margaritas, beers and more. “We were trying to find a unique way for people to order and receive their food,” said co…