Phase-Change Tableware

Food is nice. Adults, children and miscellaneous creatures have all been demonstrated to enjoy it. A recent innovation: "hot" food, has caught on with select Earth inhabitants. Unfortunately, due to physics, hot food tends to cool down at a rate proportional to the temperature differential between it and the surrounding environs. Now, a partial solution:

Take a plate, bowl, mug or whatnot and make it double walled. You can make it of anything, but stainless steel has an enviable track record in the catering industry, whereas strontium would only be useful for VERY fatty foods. So, then, you fill the gap between the double walls with something. The thing has to be a solid at room temperature and a liquid at a temperature SLIGHTLY above the best consumption temperature of the food. I recommend some form of paraffin wax. The details can be worked out by someone who enjoys graphs and tedium.

Then we have a plate that may be warmed in the oven (or on top of the toaster for the impatient), food is added, and the whole process of energy transfer can continue with mind-numbing inevitability. However, the story for the temperature will be different. The plate will miraculously stay at precisely 65C (or whatever) for a miraculously long time. Like a miracle. The consequence being that you get a few extra minutes to trawl the TV listings for something good to watch with your dinner before the whole lot becomes unpalatable. Rinse and repeat the same idea for tea/coffee cups and ice cream bowls. Just swap the phase change substance.

I see this as a more workable solution to the above problem than "consistently good TV programs" which is slightly harder to achieve than perpetual motion.