Rotten Meat

From the Castlevania Wiki, the Castlevania wiki

Rotten meat is a usable item in Castlevania: Aria of Sorrow and Dawn of Sorrow. Normally, it deducts hp instead of healing Soma, But, if he has the Flesh Golem Guardian Soul (Aria of Sorrow), or the Ghoul Guardian Soul (Dawn of Sorrow) equipped, It becomes one of the most powerful healing items within the game.