Broadening my horizons...

A few weeks ago I visited the RISC roof garden. It's a fascinating place and I can recommend their guided tours if you're in the Reading area (next open 12/13 Sept). From there I bought an intriguing little herb called Stevia. The leaves are extremely (shockingly!) sweet and it can be used in place of sugar - apparently it's much healthier too. However it's controversial (mainly for complicated political reasons) and has historically been banned in many areas...!
Another species they're growing that I'd like to try is Oxalis tuberosa or Oca. It has an edible tuber that won't succumb to the dreaded blight! If the leaves taste like those of its relative Wood Sorrel that's an added bonus :)