First, stir fry your kimchi. Heat the vegetable oil in a medium sized frying pan. Add in your kimchi and fry, over a medium heat, for 5 minutes, stirring often, until the liquid has evaporated.
Preheat the oven to 200℃/180℃ ( fan 390℉/355℉).
Combine the sausage meat, kimchi, gochujang, spring onions, and mozzarella in a bowl. Season with salt and pepper and combine well using your hands.
Lay out your puff pastry sheet. Shape your sausage meat in a large log down the length of the pastry, slightly to the right of centre.
Brush the shorter edge with soy milk. Fold over the pastry from the left hand side and roll tightly. Fold over the remaining pastry and seal using a fork.
Slice into 8 equal sausage rolls. Brush each roll with a little milk and sprinkle over some sesame seeds.
Bake for 30 minutes until golden brown and the sausage meat is cooked all the way through.
