On her Roku show "Martha Cooks," Martha Stewart sometimes cooks with famous friends like chef Jamie Oliver. She even showed him a great kitchen safety trick during one episode.

As Oliver shows Stewart how to make his lemon cheesecake, he uses his finger to stop the removable blade from falling out of a food processor while pouring custard out of it.

Stewart looks surprised and asks, "You don't know the trick with your finger?" Oliver seems confused and asks if she means using his finger to wipe the mixture off the appliance.

Stewart then shows Oliver how to hold the device from the outside to keep the blade at the bottom from moving, instead of his way of placing his finger into the food processor.