The stalk of a Cat Tail plant. This plant can be found growing mostly on the shores of swamps, lakes, rivers or ponds. You can consume these for a low amount of calories.
This is currently the only food item in the game that stacks in the inventory. They are very efficient in terms of calories-to-weight and make ideal exploration food. Cat tail stalks are always found in perfect condition and don't decay, making it impossible to contract Food poisoning from eating them.