Image from Zafferano Montefeltro. For more of Silvia’s saffron recipes:
http://zafferanomontefeltro.com/page.php?site=consumer&product=16
see also:
http://www.davidlebovitz.com/2009/04/perfect-panna-cotta/
http://www.ilariasperfectrecipes.com/authentic-gelatin-free-panna-cotta-best-perfect-italian/