Ingredients
For the pesto:
Method
First prepare the pesto. Tip the watercress, almonds, parmesan and lemon juice into a food processor and blitz, gradually pouring in the oil. Tip into a bowl, taste and adjust seasoning. If you don’t have a processor or pestle and mortar, simply grind everything in a bowl using the end of a rolling pin.
Rinse the potato cubes to get rid of any excess starch. Heat the oil in a frying pan, add the drained cubes and fry until golden brown and crisp.
Add the chopped garlic and drain over a bowl to catch any juices.
Cook the pasta in a large pan of salted water, drain and return to the pan.
Mix the potatoes, pesto, mascarpone and stock in a pan, warm over a gentle heat. Season.
Tip over the pasta and mix well. Serve immediately.