Beets

Candied Beets are a food that only Rolf is seen eating. They first appear in "Oath to an Ed" where Rolf becomes frustrated with the Eds constantly failing to earn a badge. Rolf leaves the Eds and eats the beets to calm his nerves. Rolf then decides to give the Eds another chance after finishing his beets. Beets reapper in "Dim Lit Ed" where Rolf collects a large bag of beets for Edd's scavenger hunt. Even though beets weren't needed to win, Rolf claims, "The humble beet is the answer to all riddles" and is then accused of cheating. Rolf does not say that theses beets are also candied, but they most likely are because they look identical to the beets in "Oath to an Ed."

Trivia

 * A candied beets jawbreaker appears in Ed, Edd n Eddy - The Mis-Edventures with the description saying "It calms the nerves."