makes 5 cups of caponata, enough for about 10 sandwiches
1/3 cup olive oil
1 medium eggplant, peeled and cut into small cubes, about 4 cups total
1/2 green bell pepper, diced
1 small onion, diced
4 ounces white mushrooms, chopped
3 cloves garlic, minced
1/2 cup black olives, pitted and sliced
1 6-ounce can tomato paste
3 tablespoons red wine vinegar
1 1/2 teaspoons sugar
1/2 teaspoon dried oregano
Salt and freshly ground black pepper
Baguette or ciabatta bread, to serve
Fresh mozzarella, about 2 thick slices per sandwich, to serve
Fresh basil leaves, optional, to serve