"Blue Strawberry" sounds more like a trendy new vegan restaurant than actual fruit. The real truth about blue strawberries is that they are a hoax, owing their existence — as well as their striking blue color — to Photoshop's "replace color" tool rather than to nature.
The story behind blue strawberries is that they are a genetically modified food created when scientists spliced genes from the Arctic flounder with strawberries. The fish produces a natural form of anti-freeze that could extend the growing season for strawberries in colder climates.
This experiment actually did happen, but there is no evidence at all that the resulting berries were blue, nor are there any modified seeds readily available to purchase. So if you want blue strawberries, try your luck with food coloring — or just brush up on your Photoshop skills.