- Lie the potato flat and finely slice it without cutting through to the bottom. Brush it with the butter and place it in a 200C oven for 15 minutes.
- During cooking, baste the potato in melted butter from time to time. When it is golden, remove from the oven and cool.
- Insert the pieces of chopped vegetables in between the layers, alternating between the different colours. Baste in butter, sprinkle with cheese and return to the hot oven for a few more minutes.
- Season and serve.