There is evidence that dormice were fattened for the pot- large pottery vessels with things like hamster runs inside where they lived until ready for another sort of pot! Dormouse bones turn up in the middens too.

Fruit and meat/fish are not an unusual combo of foods if you look at North African tajines and other fruit based stews and casseroles of that sort still eaten in those areas.

Mediaeval English food often had these amazing sweet/sour combos too- I've experimented with some of the recipes.