The thugs surrounded the 5ft 1in children’s food guru as she got out of her car in an upmarket London suburb.
One grabbed her by the arm while another threatened her with a hammer as they demanded her watch.
Mrs Karmel, 60, said: “I went to get something out of the boot and I looked up and there were three guys with their visors down.
“They were big guys. They came from nowhere.
“I thought, ‘If I scream they might hit me with the hammer’.”
The mother of three relived her ordeal in St John’s Wood, north London, to support the Daily Express’s Stop The Moped Menace crusade for tougher action against the two-wheeled gangs.
Mrs Karmel helped bring the three robbers to justice by noting down the number plate of one of their mopeds and identifying the bag they stole after police arrested them.
All three were jailed for robbing watches, bags and jewellery armed with hammers, knives and a taser gun in a three-month crime wave.
They hit one 70-year-old in the face with a hammer, threatened to kneecap him and took his watch as he got out of his Bentley.
Another victim was Stan Myerson, joint managing director of Northern & Shell, the company which sold the Daily Express to newspaper firm Reach in February.
Ringleader Corrie Moroney, 23, from Tufnell Park, north London, was jailed for 10 years.
Ellis Parkinson, 21, and Alan Fitzgerald, 20, both of Holloway, were sentenced to eight and four years respectively.
All admitted conspiracy to rob at Blackfriars Crown Court in February 2015.
Mrs Karmel, who presents ITV’s Annabel’s Kitchen, said: “It is a scary thought that they might be out soon or out already. There should be tougher sentences because somebody is going to get killed one day. There needs to be a greater deterrent.”
She added: “All this was really unnerving for me – it happened in broad daylight at 5 o’clock on a Friday.
“It took me a long time to be able to park my car anywhere where there weren’t millions of people around.
“I never wear a fancy watch now and I never look at my phone as I’m walking around.
“It stays with you for the rest of your life really. If somebody brushes against me in the street, I jump now.”
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