1. Cook the sausages in an air fryer with a cup of water poured in the bottom, or in a frying pan with a cup of water.
2. Finely slice the fennel from root to tip. Heat the olive oil in a frying pan and add the fennel, cook on all side for 8-10 minutes until softened then grate over some of the Comté (saving the rest to serve). Let the Comté cling to the fennel and catch slightly so it goes golden, then remove to kitchen towel.
3. Put all of the curry sauce ingredients into a saucepan and bring to a gentle simmer. Add a dash of water if it looks a little thick.
4. Pile your hot dogs in to the buns, top with the Comté caramelised fennel, curry sauce and mustard. Grate over some extra Comté and enjoy!