The Klingons in Star Trek have a rich legacy of poetry, art, and aggressively violent interactions with everyone, including themselves. They're also all about their food. But the Klingons can't just make a delicious, nutritious meal. They generally have to work some kind of off-puttingly violent imagery into it ... or simply make it kind of gross, food that requires courage just to eat.
As a result, an unsurprising number of Klingon foods include the word "blood." In fact, when the Klingons aren't eating stuff like live worms, their food seems to have a disturbingly high blood content. Case in point: Rokeg blood pie. Because who doesn't want their daily recommended serving of blood served in pie form?
To be fair, human beings have a fair number of blood puddings and the like, so it's not like the Klingons invented eating the coagulated blood of other beings. Star Trek does a great job of making the food in its stories meaningful, however, and as Memory Alpha notes, Rokeg blood pie is notable as being a comfort food for the Klingon character Worf. It's also traditionally consumed on the Klingon Day of Honor, when warriors looks back on their deeds and judge their honor.
Recipes exist, but be warned: Most use more palatable stuff like raspberry puree. If you want to make the real stuff, Food Replicator has a recipe that uses real blood. You have a blood guy, right?
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