Matty's 'Handshake Worthy' Caramelised Onion and Apple Sausage Rolls recipe - The Great British Bake Off

Ingredients

• 250g unsalted butter, frozen, grated
• 400g plain flour
• 1 tsp sea salt
• 1 tsp black pepper
• 180–200ml water to bind
• 1 large egg, for egg wash
• 2 medium brown onions, finely sliced
• 1 granny smith apple (peeled, cored and grated)
• 1 tbsp unsalted butter
• 1 tbsp olive oil
• 2 tsp black pepper
• Pinch of flaky sea salt
• 1 tbsp light brown sugar
• 800g sausage meat
• 2 garlic cloves, crushed
• 1 tsp flaky sea salt
• 1 tsp chilli flakes
• 12 sage leaves, finely sliced
• 2 tsp sesame seeds
• Cracked black pepper
• Flaked sea salt
• Sage leaves