On a coarse grater grate the cleaned raw potato. Diced sausage (I take Vienna) or the sausage and onions. On a coarse grater to grate cheese (less fat content, the better to RUB). Mix all together and drive a raw egg, add salt and pepper. Mix everything carefully.

Slice the loaf and each slice spread with ketchup.

Slathered on top of slices of baguette to put the stuffing.

The pan is heated to a temperature of 120 degrees, pour vegetable oil and put sandwiches the meat down. Fry on medium heat, without turning, under cover, until Golden brown. Prepared sandwiches lay on a plate, decorate with mayonnaise and greens. Bon appetit!