Steam the washed, unpeeled potatoes for 20 to 30 minutes. Leave to cool.
Fry the ceps.
Cut 12 slices of Emmental de Savoie. Grate the remaining piece.
Bring the white wine to the boil and add the grated Emmental de Savoie.
Halve the potatoes and scoop them out, keeping enough of the flesh to ensure they don't fall apart. Garnish with the fried ceps, 1 slice of Emmental de Savoie, and a dash of sauce.
Place in an oven at 210°C for 10 minutes to bake.
Serve as a starter on a bed of mixed lettuce salad.