Yum, lucky you !
Yes, include the liquid with the stew meat. Add chunks of turnip, potato and carrots, and if you like, parsnip and onion and summer savory, salt and pepper..
You could make a roux with flour and butter to thicken the gravey, but I prefer to let the potatoes do the thickening and let the flavor of the meat and vegetables stand out. Serve with homemade white bread or pan rolls.