Soak wooden skewers in water for 30 minutes before grilling so they don't scorch, or use metal skewers. This recipe welcomes whatever's in the garden—mushrooms, chunks of eggplant, or parboiled baby potatoes all work beautifully. No grill? Roast the skewers on a sheet pan at 425°F for 20 to 25 minutes, turning once. The balsamic glaze is optional but worth it; a good drizzle right before serving pulls everything together.