McDonald's
McDonald's Big Mac Copycat Recipe
Two thin patties, a three-piece bun and the assembly order that stops the whole thing sliding apart on the second bit…
How to Make Big Mac Sauce at Home
Big Mac Sauce, Rebuilt From the Relish Up
A sauce that tastes like the one in the box, made from six things you probably already own.
AI-generated illustration created for food.fast. It is not photographic evidence of a prepared batch.
There is a persistent, wrong idea that Big Mac sauce is Thousand Island dressing with something added. It is not, and if you start from Thousand Island you will never get there - you will get something tomato-forward, slightly pink and thinner than it should be, and you will spend a year adding things to fix a problem you created in the first ingredient.
The actual base is sweet pickle relish. That single decision explains everything else about how the sauce behaves: why it is flecked rather than smooth, why it is the colour of weak apricot rather than salmon pink, why it tastes of vinegar and sugar before it tastes of tomato, and why it thickens overnight rather than staying loose. McDonald's own published ingredient list, in every market that publishes one, puts pickle relish high and ketchup nowhere.
What follows is the version I have settled on after making this in restaurant quantities and in single-burger quantities and being irritated by the difference. It uses a small amount of French dressing for colour and acid, which is the honest shortcut the chain itself effectively takes, and it includes the one step nobody wants to hear about: leave it alone for at least twelve hours. The sauce you taste immediately after mixing is not the sauce you are trying to make.
How this page shows its working
The method gives quantities, timings and observable cues rather than asking you to guess. The 5 cases in If it goes wrong explain likely causes and corrective action; 2 ingredient notes explain choices that materially affect the result.
See the recipe verification standard · See how the cost is calculated
Why relish, and why the relish you buy matters more than anything else
Sweet pickle relish is finely chopped cucumber cured in a sugar-and-vinegar brine, usually with a little turmeric in it. That turmeric is doing something important and invisible: it is most of the colour. A relish without it gives a paler, greyer sauce and cooks reach for paprika to fix it, which introduces a smoky note that does not belong.
In the UK and Ireland the closest thing on a supermarket shelf is a sweet sandwich pickle or burger relish - not Branston, which is far too dark and malty, and not a dill or cornichon relish, which has no sugar in it at all. In Australia, a sweet mustard pickle relish works. In the US, plain sweet pickle relish in the green jar is exactly right.
If your relish comes in large pieces, chop it further. The texture you want is visible flecks suspended evenly through the sauce, not lumps that fall out of a burger on the second bite.
The overnight rest is not optional and here is what it actually does
Three separate things happen while this sits in the fridge, and none of them can be hurried.
The onion powder hydrates. Dried onion is not onion flavour in powdered form - it is dehydrated onion, and it needs water it can pull out of the mayonnaise before it stops tasting dusty. Mixed and eaten immediately, the sauce has a faint chalky edge on the finish. Twelve hours later, that edge has gone entirely.
The acid distributes. Vinegar from the relish and the French dressing starts concentrated in pockets and ends up evenly through the emulsion. Fresh from the bowl, you get a sharp spike then a flat middle; rested, you get one continuous note.
The sauce thickens by roughly a fifth. The relish gives up some of its brine to the mayonnaise, the mayonnaise absorbs it, and the whole thing sets into something that holds a peak on a spoon. That is the consistency that stays on a bun instead of running down your wrist.
Grated onion or onion powder - they are not the same choice
Grated fresh onion gives a brighter, slightly sharper sauce that is arguably nicer on a burger you are eating tonight. Onion powder gives the rounder, sweeter, unmistakably-McDonald's flavour and keeps for a fortnight instead of four days. The recipe above uses both because the combination lands closest, but if you are making this to keep, use powder only and raise it to 1 tsp.
If you cannot find French dressing
Replace the 2 tbsp with 1 tbsp ketchup, 1 tsp white wine vinegar, 1 tsp caster sugar and a pinch of paprika, whisked together first. This is genuinely close. What you must not do is use 2 tbsp of ketchup on its own - it takes the sauce tomato-red and sweet in the wrong register.
How to make it, step by step
Mix it
-
Drain the relish, but only just
Tip the relish into a sieve and let it sit for a minute. You want the free liquid gone and the relish still wet. Squeezing it in kitchen paper takes out the sugar and vinegar that you are specifically here for.
About 1 min -
Grate the onion on the fine side of a box grater
Grate over a small bowl so you catch the juice - that juice is worth more than the pulp. A microplane makes it a paste, which is fine, and a food processor makes it watery, which is not.
About 2 min -
Fold everything together in one go
Mayonnaise first, then everything else on top, then fold with a spatula until the colour is even. Twenty or thirty turns. Stop when you stop seeing streaks of white.
TipDo not use a whisk or a stick blender. Air makes it pale, foamy and thin, and it never fully recovers.About 3 min -
Taste it, then ignore what you taste
It will be sharper and saltier than the finished sauce and the onion will taste raw. That is correct at this stage. Resist adjusting anything now - you will overcorrect.
About 1 min
Rest it
-
Into a jar, into the fridge, overnight
Twelve hours minimum, twenty-four is better. Press a piece of cling film onto the surface if you are keeping it longer than two days, which stops the top layer drying to a skin.
About 12 hr -
Now taste it, and now adjust
Nine times out of ten it needs nothing. If it needs something, it is almost always a quarter-teaspoon more salt or half a teaspoon more vinegar - never more mayonnaise, which is how a sauce becomes bland and unfixable.
About 1 min
How much sauce actually goes on a Big Mac, and why yours looks wrong
About a tablespoon per burger, split between the two sauced surfaces. Most home versions use two or three times that, which is why a home-built Big Mac often tastes good but reads as "a burger with sauce on it" rather than as the thing itself.
The assembly matters as much as the quantity. Sauce goes on the bottom bun and on the underside of the middle bun - not on the top bun, and never on the patty. The lettuce sits directly on the sauce so it sticks; the onion goes on the sauce for the same reason.
Making it ahead, and how long it genuinely keeps
This is a sauce that improves for two days, holds for five and is noticeably past its best after ten. The limit is the fresh grated onion, not the mayonnaise - onion in an acidic emulsion turns slightly bitter after a week.
Made with onion powder only, sealed in a sterilised jar, it will hold two weeks in the fridge and taste the same on day fourteen as on day three. That is the version to make if you are batching.
It does not freeze. Mayonnaise emulsions split on thawing and no amount of whisking brings them back. If you have made too much, the answer is coleslaw.
What one batch costs to make, against what it replaces
| Ingredient | Amount used | Cost |
|---|---|---|
| Mayonnaise | 180 ml | £0.36 |
| Sweet pickle relish | 45 g | £0.31 |
| French dressing | 30 ml | £0.22 |
| White onion | ¼ small | £0.06 |
| Mustard, vinegar, spices | - | £0.19 |
| Total for 12 burgers' worth | 300 ml | £1.14 |
Batch sizes at a glance
| Batch | Mayonnaise | Relish | Makes | Burgers |
|---|---|---|---|---|
| 1X | ¾ cup / 180 ml | 3 tbsp | 300 ml | 12 |
| 2X | 1½ cups / 355 ml | 6 tbsp | 600 ml | 24 |
| 4X | 3 cups / 710 ml | ¾ cup | 1.2 l | 48 |
| 8X | 6 cups / 1.4 l | 1½ cups | 2.4 l | 96 |
Ways to change it once you have made it once
The spicy one
A teaspoon of sriracha and a pinch of cayenne. Fold in after the rest, not before, or the chilli heat flattens out.
Smoky, for a flame-grilled burger
Swap the sweet paprika for smoked and add ¼ tsp of chipotle powder. This is no longer a Big Mac sauce but it is very good on a Whopper-style patty.
Egg-free
Any vegan mayonnaise works and the finished sauce is close enough that blind tasters do not reliably pick it. Add an extra pinch of salt - vegan mayonnaise is usually under-seasoned.
What went wrong, and how to fix it
Each entry names a likely cause as well as a correction, so the advice remains useful when equipment, ingredients or batch size differ.
It is pink rather than pale orange
- Why it happened
- Too much ketchup or you used Thousand Island as the base.
- What to do
- Fold in two more tablespoons of mayonnaise and a teaspoon of relish. Next time, French dressing rather than ketchup.
It tastes dusty or chalky on the finish
- Why it happened
- The onion and garlic powder have not hydrated.
- What to do
- Nothing to fix - give it another twelve hours. This one really does solve itself.
It is runny and will not hold on a bun
- Why it happened
- Under-drained relish, or a low-fat mayonnaise.
- What to do
- A tablespoon more mayonnaise and an hour in the fridge. Low-fat mayonnaise cannot be rescued into this sauce; it has too much water in it by design.
It went pale and foamy
- Why it happened
- Whisked or blended instead of folded.
- What to do
- Let it stand four hours and most of the air will come out. Fold, don't whisk, next time.
It tastes sharp and thin even after resting
- Why it happened
- Relish with no sugar in it - a dill relish rather than a sweet one.
- What to do
- A teaspoon of caster sugar dissolved in a teaspoon of warm water, folded through.
Questions people actually ask about this recipe
Is Big Mac sauce just Thousand Island dressing?
No. Thousand Island is built on ketchup or chilli sauce and is tomato-led; Big Mac sauce is built on sweet pickle relish and is vinegar-and-sugar-led. They look similar in a photograph and taste obviously different side by side.
Can I make it without French dressing?
Yes. Replace the 2 tbsp with 1 tbsp ketchup, 1 tsp white wine vinegar, 1 tsp caster sugar and a pinch of paprika.
How long does it need to rest before it tastes right?
Twelve hours is the minimum for the powders to hydrate. Twenty-four hours is where it stops changing.
Can I use it on anything other than a burger?
It is very good as a chip dip, as a dressing for a shredded-cabbage slaw, and on a chicken sandwich. It is too sweet for fish.
Does it contain egg?
Only through the mayonnaise. Use a vegan mayonnaise and the recipe is egg-free.
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