Add a generous amount of olive oil to a pan on medium heat.
Sauté onion for 2-3 minutes until it begins to brown.
Crush garlic into the onion, stir, then add water and cook for another two minutes.
Remove skin from sausages, mash with a fork, then add to the pan.
Break down sausage meat in the pan as it cooks.
In a large pot, boil 5L of water, add rock salt, then add rigatoni.
Cook pasta according to package directions.
Once sausage is browned, add white wine and season with salt and pepper.
Reserve a mug of pasta water.
In a mixing bowl, mash ricotta with a fork, then combine with cheese and pasta water.
Add the ricotta mixture to the meat mixture and stir.
Grate truffle into the sauce.
Strain pasta and add it to the sauce, adding reserved pasta water.
Toss ingredients to combine.
Serve and enjoy!