Burger King's Whopper upgrade is a high-stakes bet on premiumization

Burger King announced on Thursday it will be changing its iconic Whopper recipe.

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• Burger King announced on Thursday that it will "elevate" its iconic Whopper burger recipe.
• The move comes in response to fan feedback and diners growing more selective about where they spend.
• Fast-food giants have begun rolling out upgrades to core menu items to lure guests back.

Burger King is tweaking its Whopper — and...