For best results, marinate the halloumi and vegetables for at least 30 minutes to allow the flavors to meld together. If you don't have a grill, you can also cook these skewers under the broiler in your oven. Keep a close eye on them to prevent burning. Feel free to customize the vegetables based on your preferences and what's in season. Zucchini, eggplant, or cherry tomatoes would all be delicious additions. Halloumi is a salty cheese, so you may not need to add any additional salt to the marinade. Serve these skewers with a side of couscous, quinoa, or a simple salad for a complete meal.