1 package (17.3 oz) frozen puff pastry, thawed
8 large plum tomatoes, sliced 1/4-inch thick
1 coarsely ground black pepper
1-1/2 cups (6 oz) shredded, smoked Gouda cheese
1 cup (4 oz) feta cheese, crumbled
1/4 cup pitted calamata olives, coarsely chopped
6 Tbsp chopped mixed fresh herbs such as basil, oregano and sage