First prepare the potato wedges. Place the potatoes wedges in a bowl, drizzle the olive oil, salt and pepper and rosemary. Toss to combine and place on a baking tray lined with parchment. Bake for 30-35 minutes until crispy and well cooked through to the centre.
Then start the coleslaw. Place the cabbage, carrots and onion in a large bowl and toss together. Combine the mayonnaise, lemon juice and mustard in a separate bowl, then add to vegetables. Season with salt and pepper, toss gently and keep aside until needed.
To continue, heat a non stick pan over high heat and and panfry the burger until cooked through.