I actually achieved this by accident; not really remembering that it was one of my goals for this year. My mam bought a kumquat tree for her patio and told me to try the fruit ... at first I thought she was trying to poison me as I didn't know they were definitely edible, but a quick google told me I'd be fine. They're basically like tiny oranges that taste like lemons ... they definitely turn your face! Google also told me that you should really eat the rind too as the sweetness of the rind is meant to counteract the bitterness of the flesh; tried this, don't recommend. The rind wasn't sweet at all, and IMHO didn't complement the taste of the flesh. But hey, I gave it a go, and that's what this is all about!