Why has the meat turned out to be hard like rubber?

Question

I was following this recipe for Chinese Stir-Fired Steak with Peppers.

I think I messed it up by cooking this for too long. The meat (I used lamb's meat) turned out very hard, like rubber.

I suspect this was because I cooked it for too long. Can someone confirm this? I will be much obliged.

Answer

Yup, cooking most meat too long is a bad thing. Cooking lamb too long like that will result in rubber.

Its also possible that you accidentally cut with the grain instead of against it - which would result in a very chewy, rubber like texture. You end up with long proteins that are harder to chew. When you cut across the grain, its a bunch of very short proteins.

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