Grilled Steak with Pepper Relish for Two

Name: Grilled Steak with Pepper Relish for Two
Ingredients: 1 ½ small or 1 large red, yellow and/or orange bell pepper, sliced; ½ small onion, halved and sliced; 1 tablespoon balsamic vinegar; 1 ½ teaspoons extra-virgin olive oil; 1 ½ teaspoons capers, rinsed; 1 ½ teaspoons finely chopped fresh thyme or 1/2 teaspoon dried, divided; ¼ teaspoon salt, divided; ¼ teaspoon freshly ground pepper, divided; 8 ounces sirloin steak or strip steak (1-1 1/4 inches thick), trimmed and cut into 4 portions; ½ teaspoon garlic powder