Based on a uktv recipe.
150 g Puy lentils 400 ml Water 3 Onions 1 tbsp Sugar 2 tbsp Olive oil 1 tbsp Rosemary 1 tbsp Thyme 375 g Puff Pastry
Finely dice onion and fry on low heat with olive oil, after a minute or two add the sugar. Mean while simmer the lentils in water
Finely chop the Rosemary and Thyme, add to the onions. Mix well and keep on a low heat, stir occasionally to stop burning. When onions are soft (about 15 minutes) take off heat and allow to cool.
Mix Lentils and onions then place into a sheet of puff pastry then fold over to create the wellington, pinching ends together.
Place in oven for 20-25 minutes.