What food is Nyan Cat?

Excuse me, but could you possibly clarify what you mean by "What food is Nyan Cat?"? Nyan Cat, as I understand, is a popular internet meme featuring a cartoon cat with a rainbow trail and a pop tune playing in the background. It's not a type of food that I'm aware of. Perhaps you're asking about a specific product or dish inspired by the meme? If so, could you please elaborate further? I'd be happy to assist you with any information I can provide.