01 - Preheat grill to medium-high heat, approximately 400°F. Ensure grates are clean and lightly oiled to prevent sticking.
02 - In a small bowl, whisk together balsamic vinegar, honey, Dijon mustard, olive oil, minced garlic, kosher salt, and freshly ground black pepper until smooth and well combined. Set aside.
03 - Thread kielbasa pieces, red bell pepper, yellow bell pepper, red onion wedges, zucchini rounds, and mushrooms alternately onto skewers, distributing ingredients evenly across each skewer.
04 - Brush the assembled kabobs lightly with a portion of the glaze, reserving the majority for basting during grilling.
05 - Place skewers on the preheated grill. Cook for 10 to 15 minutes, turning occasionally, until vegetables are tender and the kielbasa develops a light char.
06 - During the final 5 minutes of grilling, brush the kabobs several times with the remaining glaze, allowing it to caramelize onto the ingredients.
07 - Remove kabobs from the grill and let rest for 2 minutes before serving to allow juices to redistribute.