3 grilled and summer vegetables with pesto Recipes

orzo (about 1 1/3 cups), extra-virgin olive oil, divided, red wine vinegar, divided, zucchini or summer squash (about 9 oz total), cut lengthwise into 1/4-inch-thick slices, red or yellow bell pepper, quartered, purchased pesto, fresh lime juice, uncooked large shrimp, peeled, deveined, heirloom tomatoes (8 to 10 oz total), cored, cut into 1/2-inch cubes (about 2 cups), sliced fresh basil leaves plus sprigs for garnish, ball fresh mozzarella cheese, cut into 1/2-inch cubes

lean boneless sirloin steak, trimmed, salt, divided, black pepper, divided, red wine vinegar, zucchini , halved lengthwise, yellow squash , halved lengthwise, red bell peppers, quartered, green onions, garlic cloves, minced, commercial pesto, oregano sprigs (optional)