Grilled Veggie Burritos

Name: Grilled Veggie Burritos
Ingredients: 1 yellow squash; 1 zucchini; 1 ear yellow corn; Olive oil, for brushing; Salt and freshly ground black pepper; 4 burrito-sized tortillas; 2 cups black beans; 1/2 recipe Garlic Cilantro Lime Rice, recipe follows; 1/2 cup grated Monterey Jack; 2 tomatoes, chopped; 1/2 cup chopped onions; 1/4 cup sour cream; 1 tablespoon canola oil; 3 cloves garlic, minced; 1 large onion, chopped; 2 cups long-grain rice; 1 teaspoon kosher salt; 3 to 4 cups low-sodium chicken broth; Juice of 3 limes and zest of 2 limes (hold back juice of 1 lime for garnish); Chopped fresh cilantro, for garnish