The trick to transform mashed potatoes into a fancy and fun spread is by piping them. They'll add a splendid twist to any plain-looking mound of spuds.

Only Martha Stewart can upgrade irresistibly smooth, buttery mashed potatoes with a secret ingredient that adds tangy flavor, and decadent, creamy texture.

7-Elevens in the fine city-state of Singapore serve piping-hot mashed potatoes out of machine that looks like it should dispense coffee, not food. It’s also self-serve. For about a dollar (or two ...