Blind Vs 3-Stage Baking: What's The Difference? - Tasting Table
Briefly

Blind baking is critical for ensuring a crisp crust, especially in custard-based pies, as it allows the crust to firm up separately from wet fillings.
The three-stage bake introduces a method where the crust is first baked at high heat, then the temperature is lowered, allowing for an even browning and thorough cooking.
Read at Tasting Table
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