My big sister, Kim, called me on Saturday with a question.

She was in her grocery store in Spartanburg, South Carolina looking for the ingredients she would need to make a cake she’d found a recipe for in her local paper.

Kim’s a sucker for anything key lime, so when she saw the recipe for Key Lime Cake, she was all over it. Since it actually turns out green in color, it also seemed like an appropriate treat to make for her co-workers just before St. Patty’s Day and Easter.

But Kim had a question. She couldn’t find key lime juice at her store and wanted to know if I thought she could just use lime juice instead.

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