Classic Smash Burger With Mustard Crust

Pro tips

• Use 80/20 ground beef for the best balance of fat and lean meat; too lean won't develop flavor, too fatty creates excess grease.
• Smash the patty firmly and quickly after 15-20 seconds on a screaming hot surface to maximize crust development without overworking the meat.
• Apply mustard directly to the hot griddle before placing the patty to allow it to caramelize and fry, not just sit on cold meat.
• Don't flip more than once; one flip is ideal. A second flip disrupts the crust and makes the burger tougher.

Substitutions

• yellow mustard → whole grain mustard (earthier flavor, visible seeds)
• vegetable oil → butter (adds richness but lower smoke point, use less)
• ground beef → ground chuck (coarser texture, slightly leaner)

Storage & make-ahead

Store leftover cooked burgers in an airtight container in the refrigerator for up to 3 days. Reheat on a skillet over medium heat for 1-2 minutes per side to restore crispness.

Equipment

griddle or cast iron skillet · burger spatula or bench scraper

What's the purpose of using mustard on a smash burger?

Mustard acts as both a flavor layer and a frying medium. It caramelizes during cooking, creating a crispy, tangy crust on the burger while adding complexity to the meat.

How do I know when to smash the burger?

Place the patty on a hot oiled griddle and smash firmly with a spatula after 15-20 seconds, once the bottom begins to set. This creates maximum surface area for crust formation.

Can I use a regular skillet instead of a griddle?

Yes, a cast iron skillet or heavy-bottomed pan works well. Ensure it's preheated and hot enough to create proper crust before adding the patty.

Should I season the meat before or after cooking?

Season with salt and pepper just before cooking, not beforehand. Seasoning too early can dry out the ground beef and prevent proper searing.

How thick should the patty be before smashing?

Start with a loose ball slightly larger than your bun. When smashed properly, it should flatten to about 1/4-inch thick, creating thin, crispy edges.