Grilled Meatballs Ingredients stuffed meatballs: 1 pound lean ground beef 1 egg 1/4 cup bread crumbs 1/2 teaspoon salt 1/2 teaspoon cumin 1/2 teaspoon chili powder 1/4 medium red onion, diced very finely 1-2 cloves garlic, minced 1 cup monterey jack cheese, coarsely shredded skewers: 1 zucchini squash, cut into 1.5" cubes 1-2 red bell