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There is key lime "juice" in key lime pie.
Key limes are a type of lime.
You can find recipes for allergy friendly key lime pie at the following websites...www.thetastyalternative.com/.../bottomless-key-lime-pie-with-whippe... or at joshandemilyrichardson.blogspot.com/.../key-lime-pie-alternative.ht.
Le pie key lime