Beef Stroganoff with Sautéed Potatoes

Ingredients

• 2 tbsp Tomato Purée
• 1.5 tsp Dijon Mustard
• 75 g Butter, Divided use
• 200 ml Soured Cream
• 110 ml Beef Stock
• 150 ml Brandy
• 500 g Beef Fillet, Cut into strips
• 0.5 tsp Smoked Hot Paprika
• 1 piece Salt, To taste
• 1 piece Black Pepper, Freshly ground, to taste
• 2 tbsp Flat leaf Parsley
• 3 tbsp Olive Oil
• 1 piece Onion, Finely sliced
• 150 g White Mushrooms, Finely sliced
• 3 pieces Potatoes, Peeled and cubed
• 0.5 piece Onion, Finely chopped