Stuffed Brioche with Pork, Swiss Chard, Fennel and Cheese

Name: Stuffed Brioche with Pork, Swiss Chard, Fennel and Cheese
Prep time: 40 min
Cook time: 5 h
Total time: 5 h
Yield: 8 portions
Ingredients: 300 g plain flour; 30 g milk; 2 tsp dried instant yeast; 10 g water; 10 g caster sugar; 3 medium eggs; 2 tsp fine sea salt; 150 g unsalted butter; 60 g Parmesan cheese; 50 g mozzarella cheese; 2 garlic cloves; 200 g pork belly, boneless and skinless; 1 Tbsp olive oil; 100 g fennel; 200 g Swiss chard; 200 g water; ½ chicken stock cube (for 0.5 l); 1 tsp fine sea salt; 1 pinch ground black pepper; plain flour; 80 g soft goat's cheese; 1 egg; 1 Tbsp milk; 2 - 3 Tbsp sunflower seeds