For the sauce
3-4 tbsp extra virgin olive oil
1 onion, peeled and chopped
4 slices streaky bacon, rind removed, chopped
500g/1lb 2oz ripe cherry tomatoes, cut in half
salt and freshly ground black pepper
For the pasta
1 tsp salt
2 litres/3½ pints boiling water
250g/9oz penne pasta
20g/¾oz parmesan cheese, finely grated, to serve















