I made a chicken curry and froze it. What's the best way of re-heating it, for dinner tonight?

I would reheat over the stove at low heat in a covered saucepan. Add some water if the consistency is too thick.

What kind of curry, Indian or Thai? If it is Thai, put the frozen curry into a pot, cover, and heat on low until the curry is hot and simmering. Probably 15-20 minutes depending how much curry there is.