For The Absolute Best Tarte Tatin, Julia Child Used This Apple Variety - Tasting Table
Briefly

Golden Delicious apples bring a sweet, rich-yet-mellow taste and structural integrity to tarte tatin, making it easier to unmold without breaking.
Julia Child's recipe for tarte tatin in 'The Way to Cook' was her fourth attempt, highlighting the challenges in perfecting this French dessert.
Read at Tasting Table
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