Start by heating a large pan over medium heat. Add the butter and let it melt, releasing that familiar, comforting aroma of sizzling butter.
Add the minced garlic to the pan and sauté for about 1 minute until fragrant. This step always takes me back to my childhood, helping my abuela stir her famous sopa de fideo.
Increase the heat to high and add the beef slices. Season with salt and pepper. Cook the beef for 4-5 minutes, stirring occasionally, until browned and cooked through.
Reduce the heat to medium-low, then pour in the BBQ sauce, stirring to coat the beef evenly. Let it simmer for 2-3 minutes, allowing the flavors to meld beautifully.
While the beef is simmering, warm the tortillas in a separate pan or microwave until soft and pliable.
Assemble the tacos by placing a generous spoonful of the beef mixture into each tortilla. Top with fresh cilantro and a squeeze of lime juice for an added zing.
Serve immediately with your choice of optional toppings, like jalapeños for a bit of heat or a sprinkle of cheese for extra richness.
