Boil potatoes until cooked but not overdone. Peel and cut into 1/2 cubes.
Heat oil very hot, add and brown cumin seeds. Add potatoes and fry until they are golden brown. Add the remaining ingredients, and fry for 2-3 minutes or more. Remove from oil with a slotted spoon.
Serve hot.
Tips: Use enough oil so that the potatoes will not need to be stirred often. This avoids breaking them up.