Make the sauce first - Cook the onions down in the butter for about 40 minutes. Add the tomatoes, Worcestershire, black pepper, oregano, and parm. Simmer 20 minutes.
Make 4 burger patties, 1/3 pound each. I normally do a lower percent making burgers, but this needs to be a little leaner or the ravioli will be filled with fat when you bite into it, that's why I choose 90%.
Sear the burger on both sides. You want to cook it to medium rare because it will cook a little more in the water.
Roll out the pasta to the 3rd thinnest setting. Spread some ricotta cheese on the pasta, then put the burger on top. Add American cheese to the burger. Brush some water on the pasta dough around the burger. Add a top layer of pasta. Press it down around the burgers making sure to seal it tight. If you have a ravioli cutter, use that to make the decorative edges.
Boil the ravioli for about 6-8 minutes. Keep an eye on it for breaking. If it breaks, it isn't a huge deal, but you will want to remove the water from the inside of the ravioli before you serve it.
Dip the cooked ravioli in the sauce, pop it on to a bun, and serve!