You just need a self-buttering knife, like a self-licking ice cream cone: https://en.wikipedia.org/wiki/Self-licking_ice_cream_cone https://en.wikipedia.org/wi

You just need a self-buttering knife, like a self-licking ice cream cone: https://en.wikipedia.org/wiki/Self-licking_ice_cream_cone https://en.wikipedia.org/wiki/Self-licking_ice_cream_cone