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Ultimate In-N-Out Burger Copycat Recipe | Chef Joshua Weissman

By Arthur Salman June 28, 2026 (Updated June 29, 2026)

Ingredients · 2 yellow onions, diced · 2 Tbsp (28g) unsalted butter · Pinch granulated sugar · Kosher salt, to taste · ¾ cup (180g) mayonnaise · ½ cup (130g) ketchup ...

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