Yes, you read that right: a pie that is also pastaBut as yet another late winter storm blows into the Bay Area this week, here’s a new front-runner in the contest for the most cozy, comforting food in San Francisco: a slice of pasta pie. You can find the dish at Mattina, the Cal-Italian all-day cafe from chef Matt Accarrino. He says pasta pie previously has been on the menu at his higher-end restaurant SPQR. But ever since he opened Mattina just up the street, he’s been offering slices of pasta pie as a special and selling out regularly. The...