Plutonium pepperoni is a Cybertronian food item. Presumably it is shaped like Earth's pepperoni, and it may or may not be made of plutonium. Grimlock loves it more than either cesium salami or beryllium baloney.

Fiction

When asked on Grim Grams about whether he preferred cesium salami or beryllium bologna, Grimlock said that he found plutonium pepperoni the most delicious of them. He then complained about getting hungry and went to order some strontium spaghetti with Vector Prime's ANN expense account. Ask Vector Prime