Russian Mushroom and Potato Soup
5 tablespoons butter, divided
2 leeks, chopped
2 large carrots, sliced
6 cups chicken broth
2 teaspoons dried dill weed
2 teaspoons salt
1/8 teaspoon ground black pepper
1 bay leaf
2 pounds potatoes, peeled and diced
1 pound fresh mushrooms, sliced
1 cup...