Are White Castle burgers made of horse meat or other crappy ingredients?

I'm trying to decide what to buy for lunch and the package White Castle burgers are on sale. I don't know if I should get those or just get ground turkey to make turkey burgers. I've always liked White Castle burgers. But I'm still not sure if they're authentic. Help please LOL
Are White Castle burgers made of horse meat or other crappy ingredients?
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