Grilled Steak Burritos with Avocado Pico de Gallo

Name: Grilled Steak Burritos with Avocado Pico de Gallo
Ingredients: 1/2 lb. skirt steak; 2 tsp. ground cumin; 2 cloves garlic, minced, divided; Juice of 2 limes, divided; 4 tbsp. extra-virgin olive oil, divided; 1 8-oz. can black beans, drained and rinsed; kosher salt; Freshly ground black pepper; 3 small tomatoes, seeded and finely diced; 1/3 c. minced red onion; 5 tbsp. freshly chopped cilantro, divided; 1 avocado, diced; 1 c. Cooked brown or white rice; 4 8 tortillas; 1 1/2 c. thinly sliced romaine lettuce; Shredded cheddar cheese (optional); Sour cream (optional)