01 - Preheat grill to medium-high heat, approximately 400°F. Clean and oil the grates to prevent sticking.
02 - In a small bowl, whisk together the balsamic vinegar, honey, Dijon mustard, olive oil, minced garlic, kosher salt, and black pepper until smooth and well combined. Set aside.
03 - Thread kielbasa pieces, red and yellow bell peppers, red onion wedges, zucchini rounds, and mushrooms alternately onto skewers, distributing the 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 kabobs on the preheated grill. Cook for 10 to 15 minutes, turning occasionally, until the vegetables are tender and the kielbasa is lightly charred.
06 - During the final 5 minutes of grilling, brush the kabobs several times with the remaining glaze to build a caramelized, sticky coating.
07 - Remove kabobs from the grill and let rest for 2 minutes before serving to allow the juices to redistribute.