Eggplant and zucchini skewers are a healthy and flavorful side dish that is perfect for summer barbecues. Slice the eggplant and zucchini into rounds and then thread onto skewers. Brush with olive oil and season with salt and pepper. Grill over medium-high heat until tender and charred. Serve with a drizzle of balsamic vinegar and fresh herbs for a simple and delicious dish.