Chickpea Salad Pockets

1 540-mL can chickpeas, drained

2 tomatoes, chopped

1 cup chopped cucumber

1 cup diced cheese, (Swiss, cheddar, mozzarella, feta - whatever)

2 tbsp olive oil, or vegetable oil

1 tbsp vinegar, or lemon juice

salt, to taste

black pepper, to taste

2 or 3 6-in. pita breads, cut in half