Spaghetti Arrabiata

This is one of my favourite pasta dishes. I think onion has no place in the sauce and, on asking a Roman friend for confirmation, he stamped a fist on the table followed with ‘Never!’. I cannot argue the Parmesan, but I like just the tomato sauce, pasta and a little olive oil with no other interference. The growly faint back-of-throat chile burn is the point.