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for carving things like spoons or bowls out of wood it's usually suggested that you use something called a "hook knife" to get the round sort of hollow shape
they cost about 20 quid
I didn't want to spend 20 quid, so I got a set of 3 ring spanners from poundland and spent some time with a dremel (other rotary tools are available) and made this ring knife type thingy that does the job fine
total cost: maybe £1.10 total because I used some paracord for the handle 'cause I'm fancy like that
and I still have two other ring spanners spare