Prepare the filling by frying off the onion, celery, garlic and courgette until soft. Then add the remaining ingredients, cover with a lid and cook for 30 minutes until the jackfruit is soft and flaking. Remove from the heat and set aside to cool.
Preheat the oven to 180 degrees centigrade. Then prepare the tomato sauce by frying off the onion and garlic in 1 tbsp olive oil until soft. Add the plum tomatoes (break up with a spoon) and rinse the can with water and tip into the pan. Add the tomato purée, herbs and sugar and cook for 10 - 15 minutes. Season to taste.
Make the white sauce by mixing 2 handfuls of grated Parmesan cheese and half a teaspoon of nutmeg, into the creme fraiche.
Line the base of a high sided baking dish with chard leaves. Then fill the cannelloni tubes with the lentil mixture and lay the filled tubes on top of the chard. Next add a layer of tomato sauce and a sprinkling of feta cheese.
Add another layer of chard, tomato sauce and top with the creme fraiche another handful of Parmesan cheese.
Bake in the oven for 40 minutes, until the top is brown.
