Combine sweet potatoes, juice, butter, salt, pepper, nutmeg, cinnamon, and brown sugar; mix until well blended.
Crush cereal in plastic bag or between waxed paper.
Drop 1/3 to 1/2 cup sweet-potato mixture onto paper containing crushed cereal; roll into ball.
Place ball on pineapple slice in greased baking pan.
Repeat potato-ball and pineapple procedure until all are prepared.
Heat at 350 °F 20 minutes.