http://users.stlcc.edu/mfuller/NizhnyEthno.html I came across this site which has some interesting old photos from Russia, shoowing various craft type things. About 3/4 of the way down the page are a few pictures of spoon carving, including a massive hollowing knife. It looks to have a handle around 2 inches diameter, but I reckon this will give a powerful torque twist to cut full width shavings out of the ladles. Theres also what looks like a spoon lathe in there. Apologies if its been noted and posted previously!