Creamy Mushroom Soup

Ingredients

• 4 Tbs unsalted butter unsalted butter
• 3 lbs white or cremini mushrooms broken
• into rough pieces see note
• 2 leeks white and light green parts
• only halved lengthwise and chopped
• see Prepping and Washing Leeks related
• Salt and pepper Salt and pepper
• 4 garlic cloves minced
• 2 teaspoons chopped fresh thyme chopped fresh thyme
• 5 cups low-sodium beef broth see note
• 1/2 cup Madeira see note plus additional for serving
• 1 cup heavy cream heavy cream
• 2 Tbs lemon juice lemon juice