The joy of Mex

Mex 295 Alexander St. 262-3060, mexrestaurant.com Dinner Tue-Thu 5-10 p.m., Fri-Sat 5-11 p.m.; bar until 2 a.m. Paul Brewer is a chef on the move. He has been since he started his career as a cook at a Cracker Barrel restaurant when he was 14 years old. In the intervening 21 years, he has worked…