Classic amatriciana style pasta with pancetta, tomato, chili, and pecorino/parmesan style finish. Use pancetta (not bacon) and proper long pasta for the best texture.

Cook pasta in heavily salted boiling water until al dente, reserving pasta water.
In a pan over medium heat, cook pancetta in olive oil until fat renders and edges are lightly crisp. Add onion and cook until softened, then add garlic (if using) and chili flakes briefly. Add a small splash of white wine and let it evaporate.
Add ripe chopped tomatoes and simmer until slightly reduced and glossy. Adjust with a splash of pasta water as needed.
Toss pasta through the sauce, season with salt and black pepper, then finish with chopped parsley and grated cheese. Serve hot.