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Why is the frozen mutton roll undercooked?

The frozen mutton is not cooked well. This may be a problem with mutton. Try stewing in a pressure cooker for 30 minutes.

Frozen mutton should be thawed first, and can't be cooked directly. Pour water into the pot, add mutton, salt, ginger and onion, and simmer 1 hour.

Whether the mutton is undercooked or frozen. After thawing, the mutton is cooked like fresh.