Line a baking tray with baking paper. Draw a circle (22 cm Ø) with a pencil. Remove the dough pieces from the tin, place them next to each other on a board, halve each crosswise. Place the halves next to each other within the marked circle of baking paper with the resulting cut surface facing down.
Whisk the egg white with a fork. Brush the edges of the dough pieces with it so that they stick together when baked. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 12 minutes.
Remove from the oven, place on a cake rack and allow to cool.
Wash the tomatoes and drain well. Pour the mozzarella in a sieve, drain well. Wash basil, shake dry, pluck leaves from the stalks. Cover wreath with basil. Put one tomato, if you like 2 tomatoes and a mozzarella ball on wooden skewers.
Stick wooden skewers into the wreath. Sprinkle with pepper and sprinkle with balsamic cream.