Houston-based cooking instructor Marcia Smart demonstrates how to make her signature chipotle-lime shredded beef using simple ingredients and slow-cooked flavor that works for tacos, baked potatoes or game-day spreads. Houston-based cooking instructor Marcia Smart demonstrates how to make her signature chipotle-lime shredded beef using simple ingredients and slow-cooked flavor that works for tacos, baked potatoes or game-day spreads.