Welcome to Tex-Mex Institute of America. Great Tex-Mex in Oklahoma City, plus excellent Tex-Mex in Port Aransas! Rich in history and loaded with flavor, Tex-Mex is America’s newest ethnic cuisine! Great independent eateries offer a wide selection of beef, chicken, pork, shrimp, cheese & other featured ingredients that make Tex-Mex so popular it’s now 16.7% of the Texas restaurant industry! Enchiladas are one of the most-popular entrees, and fajitas are right up there with them. Cheesy, spicy, mild, medium, hot... it’s your choice!