We use a big black composting bin.
http://www.compostinstructions...
The scraps do pile up in there and kritters ( mice,voles) nest amongst thye vedgtables. It doesnt really freeze solid but thye decomposition is slow.On the otherhand there isnt a need for composted materials untilo spring.
We dont compost meat or bread just old boquets,vedg rinds and peelings plus eggshells and coffee grounds.
We turn it over from time to time and add leaves in fall and grass clippings duering the summer.
An open pit will attract kritters if you toss leftover casseroles and meat .
Kritters who come for vedgtable matter are usually seed eaters.
