Boil the pasta as per the packet instructions until al dente.  For perfect pasta see my instructions here.

While the pasta is cooking, chop the tomatoes, and chop the mozzarella into large cubes.

Drain the pasta.  Put in a bowl and add a splash or two of good olive oil.

Add the tomatoes and torn basil leaves (if using). Stir in.

Add the mozzarella at the end so that it doesn't melt or turn chewy.

Sprinkle with cracked black pepper.

That's it!  So easy, but so good!

If the tomatoes are not at their best, saute them in olive oil for a short time in the same pot the pasta was in to give them a "lift" before adding everything together.