I have a rump roast I tried to cook in a cast iron crock pot, around 250
degrees for five hours. I followed a recipe that used vegetables and
broth, which were about half way up the height of the roast.

First, is this a good method for cooking this type of meat?

Second, it came out dry and brittle. Would this be a sign of overcooking?
Technically the recipe called for a longer cooking time.

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W