Coat The Back Of A Spoon
A cooking technique used to test the doneness of a sauce or more typically, egg based custard. Place a spoon - wooden works well, but metal is fine too - in the mixture. Remove, and run your finger through the middle of the sauce/custard. If a clear path is left and an even run-less film is left on the spoon, the mixture is ready. Depending on the recipe the film will be thin or thick.