eh, that dirties too many dishes. Get the pasta cooked in salted water, drain it, put the pot that you cooked the pasta in on the turned off stove, add a few spoons of sauce from the jar in the fridge. The sauce will warm up from the residual heat of the pan. Add in pasta and stir it around. Your pasta is cooled from the sauce and the sauce is warmed from the pasta. Serve. Works fine with pesto and tomato sauce.