Savoury Beef and Mushroom Stroganoff

Ingredients

• 2 tablespoons extra-virgin olive oil
• 3 cups halved cremini mushrooms
• 1 red bell pepper, seeded and cut into fine strips
• 200 g small broccoli florets
• 150 ml beef stock, preferably homemade
• 1 onion, sliced
• 10 ounces beef tenderloin, cut into thin strips
• 2 tablespoons brandy
• 3 tablespoons bottled grated horseradish (optional)
• 150 ml sour cream
• Salt and fresh-ground black pepper