Preheat the oven to 200°C.
Season the teal with salt and pepper.
Melt the butter in a small ovenproof frying pan over a medium heat.
Brown the teal in the pan on all sides until golden.
Transfer the pan to the oven and roast for 8–10 minutes before resting for 4 minutes.
Heat the vegetable oil in a large saucepan for deep frying.
Fry dried sweet potato slices for 6 minutes until crisp, then drain and season.
Combine the cabbage, vinegar, herbs, garlic, oil, wine, and Calvados in a bowl to marinate.
Serve the teal on a bed of marinated cabbage with the game chips on the side.