Stroganoff Strudel

Name: Stroganoff Strudel
Prep time: 45 min
Cook time: 1 h 40 min
Total time: 1 h 40 min
Yield: 8 slices
Ingredients: 120 g water; 250 g plain flour; 20 g vegetable oil; 1 pinch fine sea salt; 3 sprigs fresh parsley; 100 g sliced wholemeal bread; ½ lemon; 2 beef fillet steaks; 1 tsp hot paprika; ½ tsp fine sea salt; ¼ tsp ground black pepper; 20 g unsalted butter; 400 g fresh button mushrooms; 2 garlic cloves; ½ beef stock cube (for 0.5 l); 1 Tbsp English mustard powder; 80 g shallots; 15 g olive oil; 2 egg yolks; 80 g sour cream