Beef Stroganoff

Name: Beef Stroganoff
Prep time: 20 min
Cook time: 1 h
Total time: 1 h
Yield: 4 portions
Ingredients: 3 ½ oz onions; 2 garlic cloves; 1 oz unsalted butter; 2 tbsp ground sweet paprika; 24 - 32 oz filet mignon; 2 tbsp tomato paste; 8 oz fresh white button mushrooms; 8 oz water; 1 heaping tsp beef stock paste; 2 tbsp Dijon mustard; 2 tbsp corn starch; ½ tsp salt; ¼ tsp freshly ground black pepper; 3 ½ oz sour cream