Ukrainian chebureks

Filling

• 100 g brown onion, cut into halves
• 15 g grapeseed oil
• 500 g beef chuck steak, sinew removed, partially frozen and cut into pieces (2 cm - see Tips)
• 10 g fresh parsley, leaves only (approx. 1 bunch)
• 1 tbsp dried marjoram or thyme
• 1 tsp salt
• 1 tsp ground black pepper

Dough

• 350 g plain flour, plus extra to dust
• 300 g water
• 30 g grapeseed oil, plus extra to fry
• ¾ tsp white sugar
• ¾ tsp salt
• 1 egg yolk