Peel the potatoes and, with a vegetable knife, cut into 28 large cylinders or corks 5 cm (2 in) long. Cut the bacon into 28 thin slices if you have not had this done for you in the shop.
Take a heavy sauté pan, large enough to hold all the potatoes side by side. Put in the potatoes, cover with cold salted water and bring to the boil to blanch them. Drain immedi