Dry wall, chalky crumbly dry wall, but obviously I'd prefer it be actually edible? 
As soon as I hit the 30 week mark of each pregnancy I have overwhelming cravings for musty cement and the gritty texture. The smell of it sets it off too! It smells like it tastes amazing and drives me mad. On my third pregnancy and really trying not to cave in and bash the wall in, and I've another 10 weeks of it! (I never gave in with the others, but it did make me extremely miserable for last few weeks). Any ideas? Help!
(I should add, I don't have any vitamin deficiencies that my bloods have picked up, anyway)