Matty's sausage roll recipe. #GBBO Ingredients For the flaky pastry: · 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 For the caramelised onions: · 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 For the sausage mix: · 800g sausage meat · 2 g