In a large Dutch oven over medium heat, melt the butter.
Add the diced onion and sauté for about 5 minutes, until translucent.
Add the garlic and cook for 1 minute, stirring occasionally.
Thoroughly wash the mushrooms and add them to the Dutch oven.
Pour in the Burgundy wine and boiling water. Add the Worcestershire sauce, dill weed, black pepper, and beef bouillon powder. Stir to combine.
Bring the mixture to a boil. Reduce the heat to low, cover, and simmer for 1½ hours.
Remove the lid and continue cooking uncovered for another 1½ hours, allowing the sauce to reduce and the mushrooms to become tender.