Crowd pleaser pierogi

Name: Crowd pleaser pierogi
Prep time: 30 min
Cook time: 2 h
Total time: 2 h
Yield: 12 portions
Ingredients: 500 g water; 600 g royal blue potatoes; 1 brown onion; 50 g salted butter; 2 tsp semolina; 300 g quark cheese; 200 g Danish feta; 1 - 2 pinches sea salt; 1 tsp ground black pepper; 10 sprigs fresh chives; 240 g warm water; 1 whole egg; 30 g grapeseed oil; 560 g plain flour; 2 pinches sea salt; warm water; 1 - 2 pinches sea salt; 2 - 3 tbsp unsalted butter; 6 rindless bacon rashers; 1 brown onion; 2 tsp sugar; sea salt; 2 tsp balsamic vinegar; 4 - 6 tbsp salted butter; fresh dill; sour cream; ground black pepper