Smash Burger with Special Sauce

A smash burger is a technique, not a size. Thin patty, screaming hot pan, pressed flat the moment it lands — what you are chasing is crust, and everything in the method exists to serve that.

The short version

Cold, loosely formed balls of 20% fat beef go into a pan hot enough to be slightly frightening. You smash once, hard, and never again. The patty cooks in about 90 seconds, the crust does the work, and the cheese goes on while the surface is still hot enough to melt it without a lid.

Do not use lean mince and do not compact the meat. Both are the difference between a burger and a hockey puck.

Ingredients

For the burgers

• 700 g beef mince, 20% fat (chuck is ideal), kept cold
• Salt and coarsely ground black pepper
• 8 slices of a fast-melting cheese such as American
• 4 soft potato or brioche buns, split and buttered
• Sliced dill pickles, thinly sliced white onion, shredded iceberg

For the special sauce

• 120 g mayonnaise
• 2 tbsp ketchup
• 1 tbsp yellow mustard
• 2 tbsp finely chopped dill pickle plus 1 tsp of the brine
• ½ tsp onion powder and ½ tsp garlic powder
• A pinch of cayenne

How to make it

1. Mix the sauce and put it in the fridge for at least 30 minutes — it needs the time to come together.
2. Divide the beef into 8 loose balls of about 85 g. Handle them as little as possible and keep them cold until the moment they hit the pan.
3. Heat a cast-iron skillet over medium-high for a full 5 minutes. Toast the buns cut-side down in butter, then set them aside.
4. Wipe the pan, add a thin film of oil, and place two balls well apart. Wait 10 seconds, then smash each one flat and thin with a stiff spatula — a square of baking parchment between spatula and meat stops it sticking. Hold the pressure for 10 seconds. Season now.
5. Cook for 60–90 seconds, until the edges are lacy and brown. Scrape hard underneath so the crust lifts with the patty, then flip.
6. Lay on the cheese immediately and give it 30 seconds more. Stack two patties together.
7. Build in this order: bottom bun, sauce, lettuce, onion, double patty, pickles, more sauce, top bun. Eat it standing up if necessary — this is not a burger that waits.

Swaps that work

• No cast iron? Any heavy stainless pan. Non-stick cannot take this heat and will not build the fond you want.
• Cheese: American is chosen for how it melts, not how it tastes. A young cheddar or a slice of raclette both work; aged cheese splits.
• Outdoors: a flat griddle plate on a barbecue is genuinely better, and it keeps the smoke out of your kitchen.
• Sauce: add a teaspoon of finely grated onion for a sharper version, or a dash of hot sauce.

Serving suggestions

Fries are traditional. A sharp, vinegary slaw or a plain green salad does more to balance it. Whatever you serve alongside, have it ready before the first patty goes down — the cooking takes ten minutes and the burgers do not improve while they wait.

Frequently asked questions