I mean warm the plates of course not roasting hot :) There are a lot of ways to do it. You'll notice a lot of restaurants do it. Some people put them under a grill for a short time. Or put a little water on them and put them in the microwave for whatever seconds. A microwave with a grill and a little bit in that does it.
The difference is great, if you've hot food and dump it on a cold plate, it immediately starts sucking the heat out of it. Warm plate = warm food for a lot longer. Just don't burn your hands!
I mean warm the plates of course not roasting hot :) There are a lot of ways to do it. You'll notice a lot of restaurants do it. Some people put them under a grill for a short time. Or put a little water on them and put them inthe microwave for whate