1: Finely slice 200 g belly (streaky) bacon (if not already sliced) and lay out flat on a sheet of cooking parchment. Cook in the oven at 360°F (180°C) for 10 minutes. This is just to lightly pre-cook the bacon, rather than cook it completely. Leave the oven on after this.
2: Peel 500 g cooked potatoeses. You should have the same number of potatoes as bacon slices.
3: Cut a small slice off one end of each potato so that they will stand upright in the dish.
4: Butter a gratin dish. Put a sage leaf and half a bayleaf on each potato, roll up in a slice of bacon and stand in the dish.
5: Prepare all the potatoes like this, packing them tight together. Drizzle a little olive oil over.
6: Bake for 20 to 25 minutes.
Remarks
If possible, use herb olive oil, rather than ordinary, to drizzle over the potatoes before they go in the oven.