Fish. Not my first choice, because its saturation level isn't as good as my preferred food - steak, but my recent Guardian Farm now gives me shed loads of fish. And I can trade raw steaks at my villager trading centre for emeralds, so makes sense to use the fish for food, as the village trades don't trade fish the same way.
Pork since it seems everyone forgets it's just as good as steak. Also pumpkin pie, which people rarely eat, though it's surprisingly good, and cheap if you have a large automatic pumpkin farm, witch/sugarcane farm, and chicken farm that only collects eggs.
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