Los descubri hace tiempo y desde entonces tengo curiosidad por saber como se hacen. Hace unas semanas los vi en una de las boutiques de Portobello Green, uno de mis rincones favoritos del mercado.
I found them several years ago at a market in Marylebone Village. I tried to find out about the technique without sucess. A few weeks ago I came accross them again at Portobello Green,(one of my favorite corners in Portobello Market) were they are also sold, unfortunately the shop was already closed.