Rock Recipes

Cooking

Sharp Stone Age spearheads were cooked then flaked - life - 28 October 2010 - New Scientist:

"If you want to make really sharp stone spearheads, do like Stone Age cave dwellers did and cook them first."

Overcooking

Bir Umm Fawakhir: Insights into Ancient Egyptian Mining:

"'The gold-bearing earth which is hardest they first burn with a hot fire, and when they have crumbled it...they continue the working of it by hand..."

Cooking with vinegar

Hannibal - Wikipedia, the free encyclopedia:

"By Livy's account the crossing was accomplished in the face of huge difficulties.[24] These Hannibal surmounted with ingenuity, such as when he used vinegar and fire to break through a rockfall."