The Food Standards Agency (FSA) said the product was only sold at Tesco, and warned customers not to eat it but to return it to the store for a full refund.
The 300g bags of Quorn Meat Free Mince carry the data code 136331 and a best before end date of August 21 2018.
It is believed some 12,000 packs are affected by the recall.
The FSA said: “No other batches or Quorn Foods products are known to be affected.”
Quorn said: “This immediate recall is a precautionary measure once we became aware that the single batch in question may contain small pieces of metal resulting from an isolated production issue.
“The safety and wellbeing of our customers is our number one priority, which is why we instigated this recall as soon as we became aware of the issue.
“The product recall is limited to Tesco stores only and any products purchased prior to 27 February 2017 are not affected by this product recall.
“No other packs of Frozen Quorn Mince 300g beyond the 12,000 under recall and no other Quorn products are affected.
“We would stress that this recall relates to a single batch of a single product on sale via a single retailer for less than two days from a single distribution depot.
“Customers are advised not consume the product and should return it to their retailer for a full refund.”
Tesco has been contacted for comment by Express.co.uk.
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