The youngster's next door neighbours made the unwelcome discovery when they opened a tin of garden peas.
Caroline Eyre said she felt sick to the stomach after opening the tin of Morrisons peas and finding a squashed slug, complete with trailing entrails, inside the can.
The 29-year-old had been just about to serve the veg up to children Callie, 12, Jack, 11, and Jimmy, three.
Instead the find put them all off their dinner - and their meat and potato pie ended up in the bin.
Caroline, who bought the peas from the Ecclesfield branch, said: "My son loved garden peas but he says he won't eat another one again now.
"It made me feel sick, it was disgusting. I ended up chucking the dinner away because the kids wouldn't eat it, and it's put everyone clean off their food."
A spokesman for Morrisons said food quality and safety was "of paramount importance".
"Ms Eyre has already been in touch with the store where she was requested to return the product and foreign body," he said. "We urge her to do so for us to carry out a thorough investigation and resolve this matter."
Meanwhile brew time turned sour for Sheffield businessman Mark Barker - when he went to make a cup of tea at work and discovered a huge spider floating in his bottle of milk.
Mark, who owns Autotek car entertainment company on St Mary's Road, made the discovery inside a litre bottle of JC Shepherd and Son's milk, bottled at a dairy at Rickett Field Farm, Dungworth.
He said the bottle had not been opened and the spider was floating on top.
Mark, 41, of Norton Lees, said: "I was just about to open it when I saw this black thing floating on top.
"I could see it was a spider and it's huge! I have been known to drink straight from the bottle - can you imagine if I'd done that this time?
"We have been having a laugh about it but I'm just wondering how on earth it got in there."
A dairy spokesman said there were strict procedures in place for checking bottles of milk.
"All our plastic bottles are inspected before they are filled and again before the tops are put on," he said. "Unfortunately these things can happen. We will gladly replace the bottle."
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The full article contains 423 words and appears in Sheffield Star newspaper.