Finely chop celery and carrot and fry on a medium heat with the oil from the sundried tomatoes.
Add in finely chopped onions, garlic, sundried tomatoes and rosemary and continue to fry until vegetables have softened.
Using a food processor, pulse the mushrooms until they are small pieces and resemble mince. Or you could very finely chop them. Add the mushroom “mince” to the pan and continue to fry until the liquid from the mushrooms has evaporated.
Add in the tomato purée, italian herbs, miso and yeast extract and stir.
Add in the red wine and balsamic vinegar and simmer until it reduces by a third.
Add passata and the sugar. Simmer until the sauce starts to thicken and then add the pre-cooked lentils. Continue to simmer for around 20 minutes, taste and add salt and pepper to taste. It shouldn’t need much salt as the yeast and miso paste are rather salty!