Wash the tomatoes, once chopped sieve them in a vegetable mill. Cook the pasta in plenty of boiling salted water. In the meanwhile heat the oil, add the garlic, the chilli, the tomato pure, a pinch of salt and pepper and simmer over a high heat for 10-15 minutes.Clean the Swiss chard and cook them in plenty of boiling salted water for 8 minutes. Then remove from the pan with a slotted spoon and keep them aside. Drain the pasta and dress with tomato sauce and Swiss chard. Serve immediately.