Cauliflower steak is a unique and flavorful option for a veggie sizzler. Slice a cauliflower head into thick steaks and brush them with a mixture of olive oil, garlic, and spices. Grill the cauliflower steaks until they are golden brown and tender. Serve the steaks with a vibrant chimichurri sauce made with fresh herbs, garlic, vinegar, and olive oil. The combination of the smoky cauliflower and tangy sauce creates a delicious and innovative veggie sizzler.