I love my clay Le Souk cooking tagine, but have only been cooking in the oven with it because I couldn't get it hot enough with the diffuser for a good simmer - but was I just too impatient waiting for it to heat? (I have never used a diffuser, and I'm scared of all the warnings that range top cooking will crack it.) I have a Viking stove. Does anyone else with a Viking (or similar) cook a CLAY (not metal enamel) tagine on the stovetop and get a simmer going without a diffuser? (Or with one?) Thanks!