Flank Steak with Corn and Red Pepper Quesadillas

Prepare outdoor grill for covered direct grilling over medium heat. From lime, grate 1 teaspoon peel and squeeze 1 teaspoon juice. In small bowl, combine lime peel and juice, chili powder, cumin, sugar, and 1/4 teaspoon salt. Rub steak with chili powder mixture to season both sides. Place steak, corn, and pepper on hot grill rack. Cover grill and cook steak and vegetables 12 to 15 minutes or until corn is browned in spots, pepper is lightly charred and tender (turning vegetables occasionally), and steak is medium-rare or desired doneness (turning steak over once). As vegetables are done, transfer to cutting board. Transfer steak to another cutting board; let stand 10 minutes to allow juices to set for easier slicing. When vegetables are cool enough to handle, cut kernels from cobs and coarsely chop pepper. Place tortillas on work surface. Evenly divide cheese, green onions, corn, and peppers on half of each tortilla. Fold each tortilla over filling to make 4 quesadillas. Grill quesadillas about 2 minutes or until browned on both sides, carefully turning over once. Return quesadillas to same cutting board; cut each in half. Thinly slice steak and serve with quesadillas and yogurt if using.