Thanks guys for the input. I add another experimentation last week, the theme was to recreate a turkish desert ''ElBulli'' s style . I use a very popular desert that most of turkish people know, it s call ''ayva tatlısı''. It s actually quinces cook in a sugar syrup with cloves, there are cook with there own seeds which gives the red color. They are served with ''kaymak'', heavy cream in english must be the accurate translation. As far as the experiment went it was quite easy I made a puree out of the cured quinces and add some of its syrup to come to a good texture. Them I added algin and cooked it in calcic bath. The result was pretty good in term of taste very close to the original, the only thing I could not reach was the intense red color of the cured quince. Here are some pics. Once again thanks you for the feed back from JK and BrianZ, believe me it s precious help. PS: working now on mango syrup raviolo Thanks for reading, Mathieu.