Slice the bell peppers and cook them in the microwave for 3 minutes (700 W).
Soak the raisins for about 5 minutes in hot water.
Roast the pine nuts for about 1 minute in a pan with the olive oil, then add the peppers, the sliced onions, and the raisins. Cook for about 5 minutes at high power. Add balsamic vinegar and pasta cooking water if needed.
Cook pasta in salted boiling water, then drain it.
Finish cooking the pasta in the pan with the vegetables.