Gnocchi alla Romana

EDIT: to make it cheaper and larger (for 6 people) 

4 cups milk, add 1.7 cups semolina, cook 5 mins and then add the knobs of butter and a couple of handfuls of grated cheese. When cutting up, do squares rather than circles so you use everything. Top with parmesan (no need for more butter) and bake. This was exactly enough, no leftovers. 

3 cups milk, heat, add 1.25 cups semolina and cook for five minutes, stirring. Add 2tbsps of cubed butter and 2 egg yolks, a good quantity of grated parmesan, and season. Chill into a sheet. Cut into rounds, or whatever you want. Arrange in a dish, sprinkle with more parmesan and butter, and cook until top is crispy. Enjoy. As Chef John says.