In a mixing bowl, combine olive oil, lime juice, minced garlic, cumin, salt, and black pepper. Add the flank steak and coat well. Marinate for at least 15 minutes.

In a rice cooker, combine rice and water. Cook according to the rice cooker instructions until fluffy.

Preheat the grill to medium-high heat. Remove the steak from the marinade and grill for about 4-5 minutes per side for medium-rare, or until desired doneness. Let it rest for 5 minutes before slicing.

In each bowl, add a serving of rice, top with sliced steak, black beans, corn, cherry tomatoes, and avocado. Garnish with chopped cilantro and serve with lime wedges.