Nigel Wright, 45, is on trial at Old Bailey on charges of deliberately spiking the pot as part of a campaign to extort £ 1.4million of bitcoin from Tesco.
Prosecutors say he bombarded the supermarket giant with letters and emails claiming he had planted poisoned goods in dozens of stores and offered to reveal their whereabouts in exchange for the money.
Ms. Kaur-Singh testified today at trial via video link.
She told the court that she was preparing to feed her nine-month-old daughter for dinner when she noticed “metal shavings” in the food.
“I didn’t think about it and just put it together,” reports the PA news agency.
The mother later found metal in a pot of Heinz pasta stars.
“I showed it to my husband and he said, ‘These are metal shavings,’ so I canned them and put in all the (baby) food,” she says.
She added, “It was like shredded metal shavings – my husband is a construction worker and he saw the metal and knew it was metal.”
Ms Kaur-Singh did not contact Tesco until she received notification of a product recall for all Heinz baby food after a jar containing shards of a homemade knife blade was discovered by a mother in Lockerbie .
The court previously heard that Morven Smith gave her 10-month-old son a jar of Heinz sweet and sour chicken baby food in December 2019 when she spotted shards of metal.
Wright, from Market Rasen, Lincolnshire, is accused of contaminating the pot with the blades and dropping it off at a Tesco in the Scottish town while delivering a tractor to a buyer on behalf of his neighbor.
In this case, Wright would have marked the bottom of the pot with a circle crossed by a cross.
Ms Kaur-Singh said she did not notice any similar marks on the contaminated jars she purchased.
A total of 42,000 jars of Heinz baby food have been recovered, although there is no evidence that more than the three found were tampered with.
Further letters from Wright to Tesco concerned Cow & Gate baby food and resulted in the removal of 140,000 units of the company’s products from Tesco shelves.
Wright denies two counts of contaminating goods and three counts of blackmail against Tesco.
He claimed to be part of a cohort of dairy farmers angry at the low price they paid for their milk, and he signed his letters “Guy Brush and the Dairy Pirates”.
He faces another blackmail charge for demanding £ 150,000 in bitcoin from a driver with whom he had a road rage altercation.
Wright admits to leading various elements of the campaign, but claims he was coerced into doing so by travelers who came to his land and threatened to kill him unless he gave them £ 1million.
He denies planting shards of metal in baby food found at Tesco’s Rochdale branch, but accepts placing the contaminated jar on the shelf at Lockerbie.
The trial is expected to last three weeks.