Start by putting the butter in a skillet and stir until melted, add the ground beef and stir until lightly cooked.
After that, season with salt and pepper, mix lightly and let it cook for 10 to 15 minutes.
Grate the potatoes and squeeze them so that all the water comes out and transfer them to a bowl, add the salt and pepper, the chimichurri, the wheat flour and the eggs, mix very well until combined. Set aside.
The meat water has already dried up, turn off the heat and set aside.
Into another skillet, add some butter and stir until melted. Add all the potato mixture and spread it into a round shape all over the bottom of the skillet.
Lower the heat, cover the skillet and let it cook for 4 to 5 minutes. After this time, flip the dough and spread the tomato sauce all over it. Add all the ground meat to one of the halves of this dough.
Add parsley to taste and finally the grated mozzarella cheese.
Close the skillet and let it all cook for 2 to 3 minutes.
Open the skillet and fold the other half of dough over the cheese.
Take it out of the skillet and serve.