Steam the potatoes for 20 minutes. Heat
When the potatoes are cooked and cool enough to handle, cut into thick slices, place in a bowl and add the lardons, tarragon (reserving a little for garnish), seasoning, the remaining
In another pan, heat the butter and cook the scallops on each side for 1 minute until golden. Place on top of the potatoes and garnish with a little tarragon. Serve at once.