Slice tomatoes into thick slices (if using smaller tomatoes, just slice in half). Place in metal pan and sprinkle with kosher salt. Place under broiler for 3-5 minutes or in 500 degree F oven for 5-7 minutes. Remove from oven and top with slices of mozzarella and basil. Return to oven for 2-4 more minutes, or until cheese is fully melted. Serve warm. *For tomatoes- If using Roma, slice in half down the center. If using Garden tomatoes, slice in thick 1/2 -3/4 inch slices. Serving Size: This will serve as many as you allow tomatoes for.