Duke Chen has cooked smash burgers at a downtown Los Angeles dive for 34 years. His process contradicts viral videos. The smash happens not immediately after the patty hits the griddle, but after 45 seconds—when the bottom is already beginning to brown. He uses a thin metal spatula, applies firm, quick pressure for two seconds, then holds the patty down lightly for another 10 seconds. This isn't about thickness; it's about timing the Maillard reaction. The Maillard Window By waiting 45 seconds, the griddle has already begun breaking down proteins and sugars on the meat's surface. The smash then increases contact without destroying this nascent crust. Too early, and you interrupt the process. Too late, and the meat seizes up. Flip after 45 more seconds. The second side needs only 30-40 seconds if you're making a thin smash (thin patties finish faster). "Smash isn't violence," Chen explains. "Smash is confidence at the right moment." Cook on high heat (cast iron or griddle at 400°F+), use 80/20 beef, don't season until after the smash. The rest is theater. But that timing—45-45-30 seconds—is the actual magic.