1. Heat oven to 375ºF. Press thawed pizza dough into a generously greased 9-by-13-inch baking pan (quarter sheet pan). Make deep indentations all over the top with your fingertips, drizzle with olive oil and sprinkle with kosher salt and rosemary.
Bake until golden, about 30 min; cool and remove from pan.
Cut 1 lb fresh mozzarella into thin slices and lay all over the top of the foccacia. Top with slices of tomato. Sprinkle with extra salt and pepper. Top with torn or chopped basil and drizzle with extra olive oil to serve. Cut into 10 pieces.
The best tomatoes are dense and a deep bright red color.