Confectioner Joseph Wiper was in the process of making mints

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Confectioner Joseph Wiper was in the process of making mints. During a moment of inattention, the sugary mixture __________ solid. The Kendal mint cake — more of a bar than a floury cake, eaten more frequently by hikers looking for a source of energy than diners in the mood for dessert — was born.

1. transformed
2. changed
3. turned
4. looked