For a tropical twist on veggie skewers, try these sweet and sour pineapple skewers. Using a food processor, you can create a tangy and sweet marinade with ingredients like pineapple juice, soy sauce, vinegar, and brown sugar. The skewers can be loaded with colorful vegetables like bell peppers, onions, and cherry tomatoes, along with chunks of pineapple. The marinade can be brushed over the skewers before grilling, resulting in a delightful combination of flavors that will transport you to a sunny beach.