Here’s a simple, UK‑friendly way to make a homemade Big Mac–style sauce that’s very close to the classic “special sauce,” using ingredients you can easily buy in UK supermarkets.

Core Big Mac‑Style Sauce Recipe (UK)

Ingredients (makes about 8–10 servings)

  • 120 g mayonnaise (about ½ cup)
  • 2 tbsp sweet pickle relish or finely chopped sweet gherkins
  • 1 tbsp very finely grated onion (with the juices) or ½ tsp onion powder
  • 2 tsp yellow mustard (like Heinz yellow mustard)
  • ½–1 tsp white vinegar
  • ½ tsp paprika
  • ¼ tsp garlic powder
  • ¼ tsp fine salt

Method

  1. Add all ingredients to a small bowl.
  2. Mix until completely smooth and even in colour.
  3. Taste and adjust: a bit more relish for sweetness, vinegar for tang, or salt to boost flavour.
  4. Cover and chill for at least 30–60 minutes so the flavours meld (overnight is even better).

Use it on: homemade Big Mac‑style burgers, fries, chicken sandwiches, or as a dip for nuggets.

UK Swaps & Tips

  • If you can’t find “sweet relish”, finely chop sweet gherkins in brine and add a pinch of sugar to mimic US‑style relish.
  • Standard UK salad cream is not ideal here; use a plain, neutral mayonnaise for the most authentic taste.
  • For a slightly lighter version, you can swap half the mayo for low‑fat Greek yogurt, but the flavour will be a bit less rich and more tangy.

Simple “Quick Version” (For One Burger)

If you just want enough for one or two burgers, mix:

  • 2 tbsp mayonnaise
  • 1 tsp finely chopped sweet gherkin
  • ½ tsp yellow mustard
  • Small pinch each of paprika, garlic powder, onion powder, and salt
  • A few drops of white vinegar

Stir, taste, and tweak until it hits that tangy‑sweet spot, then use immediately.

Information gathered from public forums or data available on the internet and portrayed here.