I think I would skip the shellac coat and go straight to the mineral oil or one of the other food safe oil finishes mentioned by the other respondants. The shellac sealer will not hold up forever, being more brittle than oil, which soaks into the wood, and even when cured is pretty supple. By sticking with a common oil like mineral oil or walnut oil the buyer also has the opporunity to keep recoating it as they want to maintain the finish and protect the wood.
Don't get me wrong, I love shellac and use it a lot. It is safe when dry, but it is also brittle. For heavily used items used alot with food probably better to stick with edible oils.