9 Facts You Didn't Know About In-N-Out's Double-Double - Tasting Table
Briefly

The Double-Double burger landed on In-N-Out's menu on August 1, 1966, thanks to Robert Lang Sr., who named it after customer requests for extra patties and cheese.
In-N-Out's philosophy of sticking to the basics and focusing on quality, rather than gimmicks, is a cornerstone of the brand’s enduring popularity and cultural phenomenon.
Read at Tasting Table
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