Potato Sandwiches

Mash four good-sized boiled potatoes; add a level teaspoonful of salt, four table-spoonfuls of thick cream, and the yolks of four hard-boiled eggs rubbed to a smooth paste, a saltspoonful of pepper, two table-spoonfuls of olive oil; mix thoroughly until you have a perfectly smooth paste. Put this between slices of brown bread and butter, trim off the crusts, and cut into triangles. The top may be garnished with cress or lettuce.