Wash and rough chop the vegetables on a cutting board. Place your onion, carrots and celery down in the bottom of the roasting pan.
In a small bowl melt 4 tablespoons of butter. Add all the seasonings to the butter and whisk to combine. Pour the seasoned butter over the turkey legs
Roast turkey legs for about 45 minutes.Transfer the roasted turkey legs and all the veggies and any of the drippings from the baking dish to a large pot.
Pour in the 4 cups of stock. Bring the pot up to a boil over medium-high heat and then turn down to a simmer and place a lid on.