Limón y Sal’s caldo de res April 20, 2021 750 × 563 Taco Week lures us to Limón y Sal Limón y Sal’s caldo de res, the classic Mexican beef soup, is rich, comforting, and very, very spicy. Limón y Sal’s caldo de res, the classic Mexican beef soup, is rich, comforting, and very, very spicy.