A smash burger is not just a flattened hamburger. The smash is the whole technique, and the technique is what creates the crust. When you press a loose ball of ground beef hard against a screaming hot griddle, the fat renders instantly and the surface area in contact with the heat increases dramatically. The result is a lacy, dark, caramelized edge that you cannot get from a thick patty on any grill at any temperature. It’s a different thing entirely.
80/20 ground beef, a hot Blackstone, a sturdy spatula, and about four minutes per patty. That’s the whole recipe.
Why 80/20 and Not Leaner
The fat is doing the work here. It renders into the griddle as the patty cooks and bastes the meat from underneath while the top sears from the heat. A leaner blend doesn’t have enough fat to do this and you end up with a patty that sticks, pulls apart, and tastes dry before the cheese even goes on. 80/20 is not negotiable for smash burgers.
Don’t season the beef before forming the balls. Salt draws moisture out of the meat and starts breaking down the proteins, which makes the patties tighter and less tender. Season the surface immediately after smashing, when the meat is already against the hot griddle.
The Smash Itself
Form four loose balls, about 4 ounces each. Loose is important, don’t pack them tight. A packed ball means a dense patty even after smashing and you lose some of the texture difference between the crust and the inside.
Place one ball on the hot griddle and immediately press it as flat as you can with a heavy spatula or burger press. You have about ten seconds before the surface starts to set and you can’t flatten it further. Press hard and hold for a few seconds. The edges should look lacy and irregular, not perfectly round. That’s what you want.
Season with salt and pepper right after smashing. Don’t touch it again for at least 2 minutes. The crust needs uninterrupted contact with the griddle to form properly.
The Flip and the Cheese
Flip once, when the edges look dark and the surface of the patty has changed color about halfway up the sides. This usually takes 2 to 3 minutes. A thin metal spatula works best, get it under the patty in one clean motion and flip fast.
Cheese goes on immediately after the flip. American cheese melts the most evenly and gives you the classic smash burger look. Sharp cheddar has more flavor but melts slightly slower. For a double smash burger, stack two patties and add one slice of cheese between them and one on top.
The second side cooks in about 60 to 90 seconds. Pull it before the cheese looks fully melted because it keeps going on the toasted bun.
Toast the Buns
Butter both halves of each bun and toast them on the griddle until golden. Brioche buns hold up best to the sauce and the juices from the patty. Standard grocery store buns are fine but go soft faster. Toast them right after flipping the patties so everything is ready at the same time.
The Sauce
This is worth making fresh rather than using plain ketchup or mustard. Mix:
- 1/4 cup mayonnaise
- 1 tbsp ketchup
- 1 tbsp yellow mustard
- 1 tsp pickle juice or finely chopped pickles
Stir and spread on the bottom bun. It takes two minutes and makes a real difference in how the finished burger tastes. Store any leftover sauce in the fridge for up to a week.
Blackstone Smash Burgers
Ingredients
Method
- Preheat Blackstone griddle on high for at least 5 minutes. Mix burger sauce ingredients in a small bowl and set aside.
- Divide ground beef into 4 equal loose balls, about 4 oz each. Do not pack tightly.
- Butter bun halves and toast on the griddle until golden. Set aside.
- Place beef balls on the hot griddle and immediately smash each one as flat as possible with a heavy spatula. Season with salt and pepper right after smashing.
- Cook without moving for 2 to 3 minutes until edges are dark and lacy and the surface has changed color halfway up the sides.
- Flip once using a thin metal spatula. Add a slice of cheese immediately. Cook for 60 to 90 seconds until cheese is just beginning to melt.
- Spread burger sauce on toasted bottom buns. Stack the patties and add preferred toppings. Serve immediately.
Notes
Toppings
Keep them simple. Pickles, raw white onion or smash-cooked onion, and the sauce are all you really need. Lettuce and tomato work but soften the contrast between the crispy patty and the bun. If you want to add them, pat the tomato dry first and add the lettuce last so it doesn’t wilt against the hot meat.
For smashed onions on the griddle: place thin-sliced onions directly under the beef ball before you smash. The onion cooks into the patty and gets slightly charred around the edges. It’s the detail that separates a good smash burger from a great one.
FAQ
Why did my patty stick to the griddle?
The griddle wasn’t hot enough, or there wasn’t enough fat in the beef. Make sure the surface is fully preheated and use 80/20. A very light coat of oil on the griddle before the beef goes down also helps.
Can I make these inside on a cast iron skillet?
Yes. Use a 12-inch cast iron over high heat. You can only cook one or two patties at a time, and open a window since smash burgers smoke. The result is almost identical to the Blackstone version.
Double or single patty?
Single with 4 oz of beef is the standard. Double with two 2 oz patties stacked after flipping is richer and messier. Both are good.
What’s the best cheese for smash burgers?
American cheese melts the fastest and the most smoothly. Sharp cheddar has better flavor but needs a lid or dome over the patty to help it melt in the short window you have between flip and finish.