Step 1

Prepare a grill for medium heat cooking.

Step 2

Brush mushrooms, zucchini, onion and bell pepper with vinegar and oil and sprinkle with salt and pepper.

Step 3

Grill vegetables, covered, until tender, turning once halfway through cooking (mushrooms and onions will take longest), 8 to 12 minutes.

Step 4

Set vegetables aside to let cool, then roughly chop.

Step 5

Spread cheese in pitas and stuff with vegetables.