Cook the pasta according to the pack instructions.
Meanwhile put the sun-dried tomatoes, basil, garlic, lemon juice and zest in a small food processor.
If you're using roasted chilli, remove the skin and the seeds and add too food processor (or add the flakes).
Drizzle a drop of the oil from the jar. Whiz, until you get a coarse paste. Season to taste and add some more oil and lemon juice, if the paste is not moist enough.
Drain the pasta, keep back 1Tbsp of the cooking water, add this to the paste.
Toss the pasta with the paste and the cheese if used.
You can serve this dish warm or at room temperature.