The vegetable claims to be more healthy than the two foods it orginates from, better for the environment and more practical for Christmas dinners.
Kalettes will be showcased at a pop-up store in Hoxton on 3 December with all profits raised going to charity.
One fan is Bridget Colvin, a chef and teacher at Jamie Oliver’s kitchen schools, who agrees that Kalettes are a better choice for festive meals.
He said: “We Brits love our Christmas leftovers almost as much as the festive meal itself. Sadly, left-over Brussels sprouts often end up in the bin, because their flavour seems to intensify once they’re cooked and that can be off-putting.
“That’s not the case with kalettes- these little beauties manage to maintain their fresh sweet taste”.
According to NHS dietician Maria Down, Kalettes have double the amount of vitamin B6 and vitamin C than standard sprouts.
“They are very beneficial for the heart, intestines and immune system, too. They’re also rich in vitamin K, a rare and powerful antioxidant, anti-inflammatory, and liver detoxifier,” she said.
The vegetable is grown in Lincolnshire, UK, with its residues used to produce green electricity and heat as part of a no-waste policy.
The product was first introduced into the market in 2014.