Ingredients:
(Serves 6–8)
2 x 400g puff pastry sheets (store-bought for speed!)
3–4 teaspoons mustard (adjust to taste)
150g hard mozzarella cheese, thinly sliced or grated
150g ketchup (for spreading or dipping)
200g bacon, cooked until crispy and chopped
1 chicken egg, beaten (for egg wash)
A bunch of dill, finely chopped