Red Lobster is adding a Mountain Dew margarita to the menu. Red Lobster Red Lobster is adding a Mountain Dew margarita — called the DEW Garita — to the menu. The DEW Garita is rolling out in select restaurants in September and will hit menus across the US by the end of the year. People were both shocked and intrigued by the electric green margarita. Visit Business Insider’s homepage for more stories. Red Lobster is adding a Mountain Dew margarita to the menu, sparking disgust and awe online. The DEW Garita will roll out at select Red Lobster restaurants in