Pot roast in the crock pot, how much broth?!
Answers:
It won't affect the tenderness either way.
For future reference, crock pots are a very moisture friendly cooking environment. A half cup to one cup should be all the liquid you need.
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When I cook anything in the crock pot..I let it cook for a while first to see how much liquid is generated by the meat and the moisture of the cooking process..
At the most 1/2 cup to 3/4 cup...
Good luck...........
Don't worry, it will be great.