Its not often that postcards make my mouth water, but this delightfully illustrated recipe version managed to do that - you may start a trend here, Desiree, or a new exchange... She says these purple fruits grow like Chinese lanterns (or Cape gooseberries?) inside papery, puffy balls until they bust through the cover revealing the fruit inside. They are apparently usually pale green, though I've never heard of tomatillos, let alone purple ones - but I love the colours and the lovely loose way they've blended into the shadows. On the envelope is a sketch of Desiree's labours to produce this interesting food. Now all I have to do is find me some purple tomatillo seeds!