The Recipe · No.882 · Diner Burger & Fry Sauce

Diner Burger & Fry Sauce, and where to source it

A spoon of the pickle brine — not just the relish — is what tips this from 'mayo and ketchup' into fast-food territory. The acid and sugar in the brine are the flavor you can't place.

Ad-free · ingredients first · no 2,000-word story.

Published July 2026 · Sourcing verified 5 Jul 2026

Prep5 min
Cooknone
Makesabout 1 cup
CuisineAmerican
Greedometer ●●●●● Getting greedy Level Some doing
Rich enough that Mom might raise an eyebrow.
Cook it with
No-cook
Suits
VegetarianGluten-freeDairy-free
Contains  eggs
Make it vegan: a flax or aquafaba egg for the egg.
Straight Answers
Can you freeze Diner Burger & Fry Sauce? — Not ideal

Not really — the cream, custard, or emulsion turns grainy or splits once thawed. This one is best kept fresh in the fridge.

Can you make Diner Burger & Fry Sauce ahead of time? — Yes

Yes — it keeps in the fridge for several days; stir or shake it before serving.

Is Diner Burger & Fry Sauce gluten-free? — Yes

Yes — nothing in this recipe as written contains gluten. As always, glance at the labels on any packaged items (broth, sauces, chocolate), since brands vary.

Is Diner Burger & Fry Sauce vegan? — Vegetarian, not vegan

It’s vegetarian but not vegan as written — it has egg. Make it vegan: a flax or aquafaba egg for the egg.

Part One
The Ingredients — and where to get them
Cook for 1 cup
Our ratio, your call. The amounts below are a tested starting point — a version, not the one and only. Anything tagged to taste is the knob you turn: start there, then make it yours.
Mayonnaise
The body of the sauce. A real, full-fat mayo carries the rest.
1/2 cuprecommended
Source it →
Ketchup
Sweet, tang, and the pink color. A cleaner ketchup without corn syrup is better.
2 tbsprecommended
Source it →
Yellow mustard
For sharpness that cuts the mayo. A stone-ground or classic yellow both work.
1 tbsprecommended
Source it →
Sweet pickle relish
Or finely chopped pickles — and save a spoon of the brine. Crunch and sweet acid.
2 tbsprecommended
Source it →
White vinegar
A little more acid to brighten. Or use the pickle brine, to taste.
1 tspto taste
Source it →
Sugar
Recommended to start — a pinch rounds the whole thing out. Adjust to taste.
1/2 tspto taste
Local / market
One list, with a link to where to buy each one.
Part Two
The Method
  1. StirStir everything together until even, breaking up any large bits of relish.
  2. RestGive it 30 minutes in the fridge so the vinegar and sugar dissolve and settle in.
  3. TasteDial it: more relish brine for tang, a pinch more sugar for the classic sweet-tart balance.
Part Three
The Toolkit

Squeeze bottle · Mixing bowl

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