Sweet Potato Strudel with Spinach and Pine Nuts

Name: Sweet Potato Strudel with Spinach and Pine Nuts
Prep time: 40 min
Cook time: 1 h 40 min
Total time: 1 h 40 min
Yield: 4 portions
Ingredients: 370 g plain flour; 40 g sunflower oil; 120 g water; 10 g vinegar; 1 medium egg; ½ tsp fine sea salt; 500 g water; 2 ½ tsp fine sea salt; 600 g sweet potatoes; 500 g fresh spinach leaves; 50 g pine nuts; ½ tsp ground black pepper; ½ tsp ground cumin; ½ tsp garam masala; 100 g quark (curd cheese); 60 g soya milk; 15 g olive oil; 2 tsp black cumin seeds