Remove the skin from the salami and cut it into thin strips.
Warm a large pan on high heat and add a generous amount of EVOO. Add a splash of water and then the onions, this will help prevent them from burning.
Cook the onions for about 5 minutes, stirring occasionally with a wooden spoon.
Meanwhile, fill a large pot with water and bring it to a boil. , Add 1 tbsp of rock salt, and allow to dissolve.
Add the penne, stirring them occasionally to prevent them from sticking, and cook according to the packet instructions.
When the onions are caramelized, add the salami strips. They cook quickly, so keep stirring to avoid any burns.
Stir in the passata, reduce the heat to medium, and season with salt and pepper. Let the sauce simmer for about 5-7 minutes.
Remove the sauce from the heat (if your pasta is not yet ready), let it sit briefly, then tear in some basil leaves and stir through.
Once the pasta is al-dente, scoop up a mug of pasta water, then strain.
If you have remove the sauce from heat, put it back on a low setting, , add the pasta, and combine well.
If the mixture seems dry, add a bit of the reserved pasta water and toss gently to combine.