What The Seasonal Yellow Caps On Coca-Cola Bottles Mean - Tasting Table
Briefly

Coca-Cola alters its recipe for Passover, transitioning from high fructose corn syrup to cane sugar, ensuring it's suitable for Jewish customers observing stricter dietary laws.
The bright yellow caps on Coca-Cola bottles during Passover are marked with 'O-U-P,' signifying their certification as kosher for the holiday by the Orthodox Union.
Historically, Coca-Cola wasn't kosher until a rabbi approached the company in the early 20th century, leading to modifications that retained its Jewish consumer base.
Passover dietary laws require abstention from leavened foods, leading Coca-Cola to substitute its usual sweeteners to comply with the needs of observant Jewish families.
Read at Tasting Table
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