Step one:

Preheat the oven to 180°C fan / 200°C conventional.

Step two:

Arrange the hot dog buns in a baking dish and generously fill each bun with the grated Applewood.

Step three:

Brush the tops of the buns with the beaten egg.

Step four:

Bake for 10–12 minutes, until the buns are golden and glossy and the cheese has melted completely.

Step five:

Meanwhile, fry the sausages until cooked through and soften the sliced onion in a frying pan until lightly caramelised.

Step six:

Place a sausage into each bun, top with the fried onions and drizzle over the tomato ketchup and American mustard.

Step seven:

Finish with finely chopped parsley and serve immediately while the cheese is hot and gooey.