Heat oil in large saucepan and sauté onions, celery, carrots and garlic on a low heat for 5 mins.
Add the bell pepper (capsicum) and continue to sauté for a further 5 mins.
Stir in lentils, tomato puree, passata, bay leaf and one cup of stock.
Bring to a boil, then reduce the heat and simmer for around 30 minutes, stirring occasionally. Check the mixture periodically, as it may stick to the bottom of some pans—add more stock as needed to prevent it from drying out.
Pre heat oven to 180℃ / 350℉
Spread half the lentil mixture to the bottom of a baking dish (approx. 9" x 7")
Cover with a single layer of lasagne, snapping the sheets to fit.
Spread the remaining lentil mixture on top and add another single layer of lasagne.
Spread the pureed cottage cheese on top and then sprinkle the cheddar cheese.
Bake for 30-40 mins (until fully heated and crispy on top)