First, you have to prep all of the ingredients before starting. The recipe will move quickly and you will burn something trying to wash the mushrooms or drain the beans.
Now, in a large pot on medium high heat add the mushrooms without oil. Allow them to sweat and release all the water.
Then add in oil, onion, carrots, garlic and celery. Cook all these ingredients together until the onions are softened and translucent.
Now, toss in the beans, potatoes then pour in the broth and crushed tomatoes. Lower the heat to medium low.
Before covering the pot, pour in the Worcestershire sauce, thyme, and sugar. Cover the pot and allow the ingredients to slowly simmer until the potatoes are tender.
Before serving, taste for salt and pepper and remove the thyme sprigs.