How to Make a Smashburger on the Grill

A smashburger is the opposite of a thick pub patty. You take a loose ball of beef, smash it thin onto a screaming-hot flat surface, and let the entire bottom face turn into a lacy, crispy, deeply browned crust. It cooks in minutes, needs almost no equipment beyond a flat-top and a sturdy spatula, and delivers more beefy flavour per bite than any thick burger. Here’s how to nail it on the grill.

Why smashing works

When you press raw beef hard against a very hot surface, you maximise the contact area and drive the Maillard reaction across the whole face of the patty. Thin means the entire bottom browns before the inside overcooks, and the craggy, ragged edges crisp into the signature lace. A thick burger can only brown its outer crust; a smashburger is almost all crust. The trade-off is that smashburgers are cooked through, not pink — which is exactly what you want from a thin patty.

Choosing the beef

Fat is flavour and lubrication here, so use beef with around 20% fat — an 80/20 mince. Leaner mince dries out and won’t develop the same juicy, crispy crust. Coarse-ground chuck is ideal. Don’t season the mince in the bowl or overwork it; handle it as little as possible so it stays loose and tender. Form gentle, loose balls of about 80–110g each and keep them cold until the moment they hit the heat. In Singapore, buy fresh chuck mince from a butcher or wet-market beef stall, or grind your own chuck for the best texture.

The hot surface

Smashburgers need a flat surface, not grill grates — the molten crust forms against solid metal, and a patty smashed onto bars would fall apart and lose its rendered fat to the coals. Use a flat-top, plancha or a heavy griddle plate set over your grill. Our griddle guide covers the options. Get it properly hot before the first smash; a lukewarm plate gives a grey, steamed patty instead of a crisp one. A light film of oil helps, but a well-heated steel plate and the beef’s own fat usually do the job.

Seasoning and the smash

Season the formed balls only with salt and pepper, and only right before they cook — salt sitting on raw mince draws out moisture and firms the texture. Place a ball on the hot surface and smash it flat and thin within a few seconds, before the bottom sets. Use a sturdy bench scraper or burger press, pressing through baking paper so the spatula doesn’t stick and tear the crust. Smash it genuinely thin — about a centimetre — with ragged edges. Season the top now.

Temperature and timing

Smashburgers cook fast and you judge them by sight, not a probe — they’re too thin to take an internal temperature reliably, and because they’re cooked through there’s no doneness window to chase. As a guide on a properly hot surface:

• First side: about 2 minutes, undisturbed, until the edges are deep brown and lacy and a crust has formed.
• Flip once with a firm scrape under the crust so it stays attached to the patty.
• Second side: about 1 minute — add cheese now so it melts as the patty finishes.

Because mince is ground from many surfaces, food-safety guidance is to cook burgers through to a safe internal temperature rather than serving them pink — and a thin smashburger does this naturally. If you’re cooking a big batch alongside other dishes and need to plan portions and timing, our meat calculator and smoking time estimator help you scale up.

Cheese and the build

Add a slice of melting cheese — American-style or a good cheddar — right after the flip and let the residual heat melt it over the craggy surface. Toast the bun cut-side down on the flat-top in the rendered beef fat for extra flavour. Build immediately while everything is hot: bottom bun, sauce, patty (or stack two thin patties), pickles, onions, top bun. Smashburgers are best eaten the moment they’re built; they don’t hold well.

Common mistakes

• Surface not hot enough — the patty steams grey instead of crisping. Preheat hard.
• Smashing too late — once the bottom sets it won’t spread; smash within seconds.
• Not smashing thin enough — a thick smash is just a normal burger with less crust.
• Flipping more than once or pressing after the flip — you squeeze out the juices.
• Salting the mince early — it firms up and turns the texture sausage-like.
• Scraping timidly — get right under the crust so it lifts with the patty.

FAQ

How thin should I smash the patty? About a centimetre, with ragged thin edges. The thinner the smash, the more crispy crust you get relative to the soft interior.

Can I make smashburgers on grill grates? Not really — you need a solid flat surface for the crust to form. Use a griddle plate or plancha over the grill instead.

What fat content of mince is best? Around 80/20 (roughly 20% fat). Leaner mince dries out and won’t crisp the same way.

Single or double patty? Two thin patties give more crust and a juicier stack than one thicker one — the smashburger move is to go thin and double up.

Where do I buy a flat-top or grill? Browse our smokers and grills or use the meat calculator to plan quantities.