Karkalla (Carpobrotus rossii) is an abundant summer fruit that should be part of every Adelaide garden. I have some growing in my front garden as a ground cover but it has never fruited. It does have cheery iridescent purply pink flowers and puts on a great show each year so for now it stays. It likes sandy soils and can survive off rainfall.
While down in Goolwa the other day I saw it growing everywhere. I saw some growing in a half wine barrel spilling over the sides which seems like a good use of space in the garden. To harvest the fruit it will be pink or reddish colour when ripe. Pinch from where the fruit attaches to the plant being careful not to squeeze the body of the fruit. Then hold the open end in your mouth and squeeze the other end. The fruit will then pop out. It tastes a bit like mandarin with a kiwi fruit texture and slight salty hit at start.