The International Kidney Potato has an excellent buttery flavour that cannot be beaten. It tastes great whether boiled or as a salad potato.. With possibly the sweetest flavour of all salad potatoes they rarely need peeling before eating due to their thin skin. Introduced in 1879 this classic early salad potatoes will produce high yields of oval smooth-skinned yellow-fleshed tubers that have proved to be extremely popular over the years. If you want slightly larger potatoes just leave them in the ground a little longer.