- STEP 1
Cook the pasta following packet instructions. Meanwhile, cook the peas and garlic in a separate pan of boiling salted water for 3-5 mins, until tender. Drain well, keeping some of the water.
- STEP 2
Put the peas, garlic and watercress in a food processor with 2 tbsp of the pasta cooking water. Whizz to a very rough purée.
- STEP 3
Return the pasta to the pan. Stir in the pea mixture, mascarpone, tarragon and lemon zest and juice. Season with salt and pepper and serve with crusty bread.