Prickly Pears are harvested from the tops of Prickly Pear Cacti, found exclusively in Volcanic Deserts. The fruit, when eaten raw, restores 3 hunger points (1.5 hunger icons) as well as inflicts 1 damage to the player (half a heart, so very little). They are a low-tier food when raw.
When cooked, a Prickly Pear becomes a mid-tier food, restoring 4 hunger points (2 hunger icons) without dealing damage.
Prickly Pear Cacti can be broken and replanted in Sand anywhere, although they may only grow in darkness, as many Erebus plants do, but this is not confirmed.