I recently bought a tagine for cooking. I have to season my tagine by heating it in the oven with the temperature below 300 F. My oven works with two settings of 350 and 375F. May I prepare my tagine for use on the stovetop with a diffuser or does it has to be prepared for the initial use in the oven? May I use a higher temperature of 350F? Please help me with your advice.