What food did Marcel Proust taste in real life before changing it into a madeleine in his novel?

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In real life, the food Marcel Proust tasted that triggered the involuntary memory later immortalized in his novel was a rusk—a type of twice-baked bread—dipped in tea. While this experience served as the catalyst for his literary exploration of memory, he chose to transform the rusk into a madeleine within the narrative of his masterpiece, In Search of Lost Time.1