Put the meat in a saucepan and cover with water. Add the mustard seeds, pepper and coriander, then boil. Boil until the meat is soft enough. Remove to a plate, leave to cool and cut into cubes.
In a bowl, mix the mozzarella and cheese on a large-mesh grater. Add cream cheese, sour cream and egg and mix. Flavor with salt, pepper, hot pepper flakes, garlic, some Provence herbs and basil leaves. At the end we incorporate the pieces of meat.
Pour the composition into a heat-resistant dish greased with oil and cover with a generous layer of cornflakes. Put the dish in the oven for about 40-45 minutes, until it starts to brown slightly.
"Mom, he was very good. Thank you for the meal!"