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Vanilla Custard Sponge Cake (Genoise with Caramel and Custard Soak)

Recipe by Claire Saffitz x Dessert Person

A layered custard cake that combines the airy lightness of a genoise sponge, a thin dry caramel base, and a rich vanilla‑infused baked custard soak. Inspired by tres leches and flan, this dessert is baked in a water bath for a silky, wobbly center and finished with a fragrant vanilla aroma.

HardFrenchServes 8

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Source Video
6h 51m
Prep
2h 45m
Cook
1h 9m
Cleanup
10h 45m
Total

Cost Breakdown

Total cost:$9.26
Per serving:$1.16

Critical Success Points

  • Warming the egg‑sugar mixture to 113°F without cooking the eggs
  • Folding the flour gently to preserve the airy foam
  • Making a dry caramel without water to avoid crystallization
  • Tempering the custard mixture to prevent curdling
  • Baking the assembled cake in a water bath until the center reaches 170°F

Safety Warnings

  • Caramel reaches >300°F; handle with heat‑proof gloves and keep children away.
  • Hot water bath can cause steam burns; use oven mitts when removing the pan.
  • Custard contains raw eggs; ensure it reaches 170°F to fully cook the eggs.

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