Get1 casserole dish
Some herbs and stuff like that
DoTurn the stereo up loud.
Slice up everything. Get it all together in the dish in layers. Start with a layer of onions, then tomatoes, then cheese. Do this until you fill the dish or it's at least an inch thick. You can sprinkle herbs in as you do this, if you want. Put extra cheese on top and bake it in a moderately hot oven until the cheese starts to go brown.
This dish is called "Train Smash" because it looks like one when you put it on plates.