What Is Really in in-N-out Spread? Flavor Chemistry and Facts
To build an authentic clone at home, measure your ingredients by weight rather than loose spoonfuls. This maintains the essential balance between sugar, fat, and acetic acid.
Mix 1/2 cup (115g) full-fat mayonnaise with 3 tablespoons (50g) standard tomato ketchup, 2 tablespoons (30g) well-drained sweet pickle relish, 1 teaspoon (5ml) distilled white vinegar, and a tiny pinch of fine sea salt. Skip fancy ingredients like smoked paprika, garlic cloves, or Worcestershire sauce. The strength of this sauce lies in its straightforward fast-food roots.
Once mixed, let the sauce rest in the refrigerator for at least 60 minutes before serving. This rest period isn't optional. Acetic acid needs time to tenderize the relish bits and dissolve the remaining sugar crystals, while the fat molecules absorb the natural color compounds from the ketchup. The result is a smooth, balanced spread with the familiar pale salmon color.