Add flour, butter & salt in a large bowl, mix everything well.
Add a little cold water to it and just make sure the mixture forms a dough shape. Don’t knead it, just combine everything and freeze it for 30 minutes.
Cut mozzarella into thin slices.
On a lightly floured surface, roll out the dough into a round shape about ⅛-inch (3 mm) thick. Roll the dough around the rolling pin and transfer it to the prepared baking sheet.
Put the mozzarella slices on the sheet and then tomato slices. Sprinkle some salt on top and some basil leaves.
Freeze it for another 20-25 minutes. Brush some egg wash on the sides and sprinkle some sesame seeds.
Bake at 200 degrees c / 400 degrees F for 35-40 minutes.
Remove from the oven and top with fresh basil leaves. Slice and serve immediately with some parmesan on the side. Enjoy.
Notes
Recipe notes:Use parchment paper to prevent sticking. Be sure to refrigerate dough before rolling. Use extra flour to prevent sticking to rolling pin.