The woman from Plymouth found the popular snack covered in black mould, despite being three months past its best before date.
She'd ordered them from a shop before Christmas, hoping they'd encourage her kids to consume more dairy.
The mom, who prefers to remain anonymous, said her kids were saddened by the Cheestrings.
The best before date on the label is March 30, 2022.
‘These mouldy Cheestrings wrecked our Christmas cheese platter. Devastated kids
‘The only way to get dairy into them is via Cheestrings, which are now mouldy.
‘They didn't eat them. And I had ordered a replacement, which I can't get to Tesco. Lest we forget,
The dairy-loving mum says she complained to Tesco online.
Her email was merely returned as unmonitored by an automatic system.
Kerry Foods, the product's manufacturer, has been approached for comment.