Directions

1. Coat grill rack with nonstick cooking spray. Preheat grill to medium-high (350°F to 400°F). Place steak in a large bowl; set aside.
2. Place cumin seeds in a small skillet. Cook over medium heat 1 minute or just until fragrant, stirring or shaking skillet occasionally. Add oil, jalapeño and garlic; cook and stir 30 seconds. Remove from heat. Stir in lime juice, cilantro (if desired), and salt to taste. Pour over steak cubes; toss to coat.
3. Alternately thread steak, squash and bell pepper onto 6 (10- to 12-inch) skewers.? Season with salt and pepper to taste.
4. Place skewers on grill. Grill, covered, 10 minutes or to desired doneness, turning occasionally. Remove from grill, and serve.