I've been using a latte mug for preparing my cream. I'm happy with the setup for the most part, but I'd really like something with more heat retention. I don't like the idea of a hotpot, so I got to thinking about what might be a simple, but effective method for keeping the cream warm. Enameled cast iron immediately came to mind. Excellent heat retention and no rust problems. I imagine you would have to be careful not to drop it lest you damage tile floors, porcelain, etc., but that was the only drawback I could come up with. A search has yielded no results for mugs. I did find some oriental looking tea cups and Staub makes a 4 1/2 inch enameled bowl that might fit the bill. Any thoughts or experience in this area?