Roll out the filo pastry and use a glass (or round cookie-cutter) to cut out as many circles as you can.
Put the ground meat in a bowl and mix it well with the mustard, basil, and tomato paste, plus salt and pepper.
Place about a tablespoon full of the ground meat mix on 2/3 of all the circles (in the middle of each circle). Put equal portions of the grated cheese on the remaining circles.
Fold each circle over at the middle and then press the corners together, for a tortellini-shaped dumpling.
Place the filled dumplings into a baking form, for instance a quiche form or a springform cake pan. Put one cube of cheese on top of each of the outer ring of dumplings. Baste the whole thing with the whisked egg.Bake in the oven for 40 min at 375°F, with the air circulator on. When it's done, cut the torte into slices and bring the tantalizing dish straight to the table.