01 - Preheat grill or grill pan to medium-high heat, approximately 400°F.
02 - Combine melted butter, minced garlic, chopped parsley, lemon zest, salt, and black pepper in a small mixing bowl. Whisk until thoroughly incorporated.
03 - Thread zucchini rounds onto skewers, leaving approximately ¼-inch space between each piece to ensure even heat circulation and cooking.
04 - Brush zucchini skewers generously with half of the garlic butter mixture, ensuring each round receives even coverage.
05 - Place skewers on preheated grill and cook for 3 to 4 minutes per side, turning once, until zucchini becomes tender and develops light char marks.
06 - Remove skewers from grill and immediately brush with remaining garlic butter mixture while still hot to maximize flavor absorption.
07 - Sprinkle with grated Parmesan cheese if desired and arrange on serving platter with fresh lemon wedges on the side.