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Sep 20, 2018 at 13:30 comment added Willk @T.E.D - they could press oil from grains / seeds / fruits but that is throwing out a lot of food value. They could use crude oil which was known and used as tar.
Sep 20, 2018 at 11:33 comment added T.E.D. Not sure the oiling could be done with medieval tech, but yes the rest is quite possible.
Sep 19, 2018 at 13:52 history answered Willk CC BY-SA 4.0