Why smash the patties thin instead of making thick patties?
Smashing thin patties creates a larger surface area for browning, developing a crispy crust and caramelized edges while keeping the meat tender inside. Thick patties tend to stay gray in the center.
Can I make the burger sauce ahead of time?
Yes. Mix and refrigerate the burger sauce up to 3 days in advance. Bring to room temperature or stir well before serving.
What temperature should the beef patties reach?
Cook smash burgers to 160°F internal temperature for food safety. With thin patties and high heat, this happens quickly—usually 1-2 minutes per side.
Can I use a different cheese instead of American?
Yes. Cheddar, Swiss, or provolone work well. American cheese melts most evenly due to its emulsifiers, so adjust timing if using other cheeses.
How do I get the onions grilled properly?
Dice the onions finely and cook in a hot pan or griddle with a bit of butter until caramelized and golden, about 5-7 minutes. Season lightly with salt.