Preheat your grill to medium-high heat.
Wash and prepare all vegetables as specified.
In a large bowl, toss the vegetables with olive oil, salt, and pepper.
Place the vegetables in a single layer on the grill.
Grill the zucchinis for about 3-4 minutes on each side.
Grill the bell peppers until slightly charred, about 4-5 minutes.
Cook the eggplant slices for approximately 4 minutes on each side.
Grill the red onion wedges for about 5 minutes until soft.
Remove vegetables from the grill and transfer to a serving platter.
Garnish with fresh herbs before serving.