Beef fillet casserole with sour cream and mushrooms

Ingredients for 4 servings:

• 750 g beef fillet(s), steak or other good beef
• 380 g onion(s)
• 400 g mushrooms
• 2 cups of sour cream, 200 g each
• 2 cups broth
• 100 g herb butter
• salt and pepper
• Clarified butter

Instructions

Working time approx. 45 minutes; Rest time approx. 12 hours; Cooking/baking time approx. 1 hour 30 minutes; Total time approx. 14 hours 15 minutes

Cut the beef into finger-width slices. Heat clarified butter in a pan. Briefly sear the beef on both sides. Place the seared meat side by side in a casserole dish, brush with herb butter, and sprinkle with salt and pepper. Peel and slice the onions, trim and slice the mushrooms, and saute the onions. Sauté the onions in clarified butter and sear the mushrooms. Use the same pan you used to sear the meat. Spread the onions and mushrooms over the meat. Add the sour cream to the pan, fill the empty cups with broth, and mix with the sour cream. Pour this sauce over the meat, onions, and mushrooms. Cover and refrigerate overnight. Preheat the oven to 180°C (fan oven) and sear the meat for about 90 minutes. Better cuts of meat, such as fillet, may need less time; others can cook for up to 2 hours. We like to serve this with rice and fresh salad.