Ingredients: 6 tbsp unsalted butter1 tbsp olive oil1 leek, white and light green parts only, thinly sliced3 celery stalks, diced4 small shallots, thinly sliced4 garlic cloves, minced1 tbsp white miso paste4 tsp thyme leaves, chopped5 cups mushrooms, sliced (approximately 1 lb)½ cup white wine5 tbsp AP flour4 cups chicken or vegetable stock½ cup-1 cup heavy