Courgett and lentil lemony soup

1 onion, finely chopped
2 handfuls of green lentils
2 handfuls of red lentils
courgettes, roughly chopped
lemon juice
vegetable or chicken stock

Fry the onion in olive oil until soft before adding the courgettes and frying for another couple of minutes.

Add the lentils. Add the stock and bring to the boil. Simmer for 40 minutes or until the lentils are soft.

Season with salt and pepper and squeeze in the lemon juice.