In a large bowl, gently toss the quartered feta, zucchini halves, and onion slices with 2 tablespoons (30 ml / 1 fl oz) of the Italian dressing.
Season generously with salt and pepper and set aside.
Preheat your grill to medium heat (about 350-450°F or 175-230°C (450°F)).
Place a 6-inch cast-iron skillet on the grates to preheat.
Place the zucchini and onion directly on the grill rack.
Grill for about 8 minutes, flipping once, until tender and nicely charred.
Remove the vegetables from the grill.
Add the pita bread and tomato wedges to the grill.
Grill for about 2 minutes, or until the pitas are toasted and the tomatoes are lightly charred.
Carefully place the feta cheese quarters in the hot skillet on the grill.
Cook for 1 to 2 minutes, just until the cheese is softened and warmed through.
Remove the skillet, pitas, and tomatoes from the grill.
To serve, cut the grilled zucchini into bite-sized chunks.
Arrange the softened feta, grilled vegetables, and tomatoes on a platter with the warm pita bread.
Drizzle everything with the remaining 2 tablespoons (30 ml / 1 fl oz) of salad dressing and the honey.
Serve immediately.