Flank Steak Tacos with Guacamole (Adapted from Food Network) - Tailgate Guru

Ingredients

• 1 (2 to 3-pound) flank steak
• 1/2 cup tequila
• 1/2 cup freshly squeezed lime juice
• 1/4 cup olive oil
• 1 tablespoon ancho chili powder
• Kosher salt and black pepper
• 3 avocados
• 1 small red onion, finely diced
• 1 serrano or jalapeno pepper, minced with seeds
• 1/2 cup roughly chopped cilantro leaves, plus whole leaves for garnish
• 2 to 3 tablespoons fresh lime juice
• Kosher salt