Vaca Frita with Black Beans and Coconut Lime Rice

Ingredients

• 2 pounds flank steak
• 1 cup shredded cheddar cheese
• 1 whole yellow onion
• 4 cloves garlic
• 1 whole lime
• 1 large head of lettuce
• 2 cups long-grain white rice
• 1 can black beans
• 1 can coconut milk
• 2 teaspoons ground cumin
• 1 teaspoon dried oregano
• 1 teaspoon salt
• 1/2 teaspoon black pepper