01 - Set grill to medium-high heat, targeting approximately 400°F. Allow grates to fully heat for optimal searing.
02 - In a small bowl, whisk together 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 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 kielbasa develops a light char.
06 - During the final 5 minutes of grilling, brush the kabobs generously several times with the remaining balsamic honey glaze to build a caramelized finish.
07 - Remove kabobs from the grill and let rest for 2 minutes before serving to allow juices to settle.