Heat the oil in a large frying pan and fry the sausages for 5 minutes until evenly browned, remove and set aside.
Add the pepper and leek to the pan and fry for 3 minutes. Thickly slice the sausages and add back to the pan with the peas, Walnuts and lentils and cook for 3-4 minutes.
Stir in the mustard and crème fraiche and heat through.
Notes
Cooks tipServe half straight away and save the rest for the next day as a cold salad in a lunch box or freeze the other half for a later date.Salt: 1.7g