Not bitter. Full of zesty, sweet clementines or any thin skinned, sweet oranges but seedless ones. Even if you (think you) dislike marmalade, you'll love the tart, citrus, non bitter taste of this. Small eating oranges have a nice balance between sweet and acid. The skins are thin and this makes for a delicate shred. Clementine or Mandarine or Tangerine marmalade is not as authentic as Seville but this marmalade is easier (no pits), and every bit as tasty.