I used to make a chestnut and mushroom stew that was gorgeously savoury and worked well in the place of a beef stew.
No recipe because I made it up, but basically:
Onions, garlic, carrot
Fresh chestnuts
Closed cap mushrooms but not as small as button mushrooms
bay leaf
thyme or mixed herbs
tin of tomatoes
tomato puree
dark brown sugar
something umami but tangy like Worcestershire sauce (not strictly veggie as contains fish), Henderson's sauce, marmite, or soy sauce and tamarind
red wine
salt and pepper
Prep the chestnuts by either roasting and peeling or microwaving and peeling. If you haven't done this before google for how. A lot of them will break but that's fine because the broken bits break down to thicken the sauce.
(Peeling chestnuts takes forever so put a good show on and peel while you watch.)
Soften onion in olive oil or butter
Add garlic and carrots and soften a bit more
Add cooked peeled chestnuts and halved mushrooms
Sautee for a minute or two then add tomatoes and tomato puree, water, bay leaf, mixed herbs or thyme and a little dark brown sugar
Simmer about twenty minutes then add red wine and the something tangy and umami
Simmer down til the stew has a satisfying mouth feel and flavour, probably another twenty minutes or so, adding seasoning as needed.
Peeling the chestnuts is a faff I know, but tastes so much better than vacuum packed. I think the taste is totally different.