Generously butter a 9 x 13 sheet pan (or line with plastic wrap) and set aside.
Step 2
Bring the butter and milk to boil over medium heat. Remove from heat, and sprinkle in the semolina flour in stages until no lumps remain.
Step 3
With a rubber spatula or wooden spoon, beat in the Parmigiano-Reggiano cheese, and season with the nutmeg, salt, and pepper. Then add in the egg yolks.
Step 4
Spread evenly into the prepared sheet pan, let cool, cover with plastic wrap, and refrigerate until cold and firm, several hours or overnight.
Step 5
Using a biscuit cutter, cookie cutter, or drinking glass, cut out circles and overlap them in a buttered baking dish. Cover with red sauce, and top with aged cheddar. Bake at 400ºF (200ºC) for 25 minutes or until hot and bubbling.