01 - If using wooden skewers, submerge them in water for at least 20 minutes to prevent burning on the grill.
02 - Set the grill to medium-high heat, targeting approximately 400°F. Allow the grates to fully preheat for even cooking.
03 - In a small saucepan over low heat, melt the butter. Add the minced garlic and cook for 1 minute until fragrant. Remove from heat and stir in the chopped parsley, lemon zest, salt, and black pepper.
04 - Thread zucchini rounds, bell pepper pieces, and red onion chunks alternately onto each skewer, distributing the vegetables evenly.
05 - Generously brush the assembled skewers with half of the prepared garlic butter, coating all sides of the vegetables.
06 - Place the skewers on the preheated grill and cook for 3 to 5 minutes per side, turning occasionally, until the vegetables are tender and show light char marks.
07 - Remove the skewers from the grill and immediately brush with the remaining garlic butter while still hot.
08 - Arrange the skewers on a serving platter alongside lemon wedges and serve warm.