01 - If utilizing wooden skewers, immerse in water for at least 20 minutes to minimize burning during grilling.
02 - Set grill to medium-high heat, approximately 400°F.
03 - In a small saucepan over low heat, melt unsalted butter. Add minced garlic and cook for one minute until aromatic. Remove from heat and mix in chopped parsley, lemon zest, salt, and black pepper.
04 - Alternately thread zucchini rounds, bell pepper pieces, and red onion chunks onto each skewer.
05 - Brush vegetables on skewers generously with half of the garlic butter mixture.
06 - Position skewers on the grill. Cook for 3 to 5 minutes per side, turning intermittently, until vegetables are tender and lightly charred.
07 - Remove skewers from grill. Immediately brush with the remaining garlic butter for optimal flavor penetration.
08 - Arrange cooked skewers on a serving platter and garnish with lemon wedges. Serve while warm.