Dice the sun-dried tomatoes and mozzarella, add to the pasta and mix everything together. Do not throw away the tomato oil, you will need it in the next step!
For the sauce, mix the pesto rosso with a good dash of the leftover oil from the tomatoes and season everything with balsamic vinegar, salt and pepper. If the sauce is too thick, stretch it with water.
Mix the sauce with the pasta. Just before serving, add the chopped rocket, otherwise it will be too mushy.
Scatter roasted pine nuts over the top if you like.