TerraFirmaCraft adds its own food rotting mechanics that I think could pair really well with The Betweenlands, I would like to suggest that (configurably) any food that is taken into The Betweenlands that isn't configured to stay fresh in the dimension should rot rapidly/immediately using TFC's mechanics, in favour of The Betweenlands rotten food items, and likely stay rotten from then onwards, given reversing those effects wouldn't really be ideal.