The fish-free product is already available in major UK retailer Sainsbury's - and will hit Tesco stores later this year.
'Packed with protein'
"Drum roll, please," the brand wrote on Instagram. "Introducing, the newest addition to the Linda McCartney's range: Vegetarian Fishcakes!
"Packed with protein and low in saturated fat, our brand new Vegetarian Fishcakes are the perfect quick fix for a delicious #veganfriendlydinner."
Earlier this year, Linda McCartney launched a new kind of vegan-friendly sausage - made from pea protein.
The Vegetarian Lincolnshire Sausages, which are stocked in the freezer aisle in Tesco, were the first pea protein product from the veggie giant.
"With 2019 being tipped as the year that meat-free truly goes mainstream, there's never been an easier time to reduce your meat consumption and stock up on delicious meat-free alternatives," a spokesperson told Plant Based News.
"Linda McCartney paved the way almost 30 years ago for today’s vegetarian movement. As the original meat-free pioneer, she inspired a generation and her legacy continues to reach far and wide today, with vegetarian and vegan eating becoming a norm."