Is In-N-Out's Sauce Just Thousand Island Dressing? Not Exactly - Tasting Table

"In-N-Out Burger's menu is small but mighty, featuring a 'not-so-secret' secret menu where items can be ordered 'animal style', topped with grilled onions, pickles, and special sauce."

"The special sauce, referred to as 'spread', has remained consistent since 1948, with main ingredients including soybean oil, cucumbers, tomatoes, white vinegar, and whole eggs."

"In comparison, Kraft's Thousand Island dressing has similar ingredients but may include variations like mustard powder and dried onion, while In-N-Out's spread features garlic."

"In reality, In-N-Out's spread and a classic Thousand Island dressing are very similar, making it challenging for most to differentiate between the two sauces."

In-N-Out Burger features a small menu with a 'not-so-secret' secret menu, including items ordered 'animal style'. The restaurant's special sauce, or 'spread', has remained unchanged since 1948. Key ingredients include soybean or canola oil, cucumbers, tomatoes, white vinegar, and whole eggs, along with seasonings like sugar, mustard seeds, and garlic powder. Comparatively, Kraft's Thousand Island dressing shares similar ingredients but varies slightly in composition. Both sauces are very similar, making it difficult for most to distinguish between them.

Read at Tasting Table