For a deeper, richer flavor, consider using dark brown sugar in the glaze. Adjust the amount of panko bread crumbs to achieve the desired consistency of the meatball mixture. You want it to be firm enough to hold its shape but still tender. If you don't have an outdoor grill, you can pan-fry the Tsukune in a lightly oiled skillet over medium heat or bake them in a preheated oven at 375°F (190°C) for about 20-25 minutes, or until cooked through. Feel free to customize the seasoning blend to your liking. A pinch of red pepper flakes can add a subtle kick, while a dash of sesame oil can enhance the nutty aroma. Tsukune are best enjoyed fresh, but leftovers can be stored in an airtight container in the refrigerator for up to 2 days. Reheat gently before serving.