In a large soup pot, brown the sausage
Remove the cooked sausage and drain on a paper towel
Add the mushrooms to the sausage drippings left in the pot and cook
While the sausage and mushrooms are cooking, dice the onion, carrots and celery and chop the potatoes in bite size chunks
Remove mushrooms and drain with the sausage
Add onion to the soup pot and cook for 3 minutes, stirring often
Add in the carrots and potatoes and cook for another 5 minutes, stirring often
Add in the celery and poultry seasoning and stir
Add in 1 cup water and let simmer until the potatoes are tender
Add the mustard and bone broth and let simmer, covered on low heat for another 30 minutes
I serve this topped with fresh dill as a garnish