When Smashburger opened its first restaurant in Denver, Colorado, in 2007, the concept of creating a flavorful crust by smashing a hamburger patty onto a flat grill was not new. However, this chain, which has expanded to over 240 locations across seven countries and 34 states, significantly popularized this burger patty cooking style.

What sets Smashburger’s hamburgers apart from other smashed patty burgers is the addition of a top secret sauce slathered on the face of the top bun. A good clone of the special sauce is an excellent addition to your home burgers and also serves as a tasty dipping sauce for finger foods. My Smashburger Smash Sauce copycat recipe below is a simple combination of mayonnaise, mustard, lemon juice, plus a few other crucial ingredients, and it will take you less than five minutes to make.

You can use the sauce on your home burgers or for dipping clones of the chain’s signature Smashfries and Smash Tots, which I’ve also hacked for you here. Both the menu and servers will tell you that the fries are tossed with olive oil, rosemary, and garlic, but they all stop short of describing anything else about the recipe. A quick examination of the fries makes it clear that there are other herbs in the mix, so I took a closer look back at the lab and eventually came up with a blend of three fresh herbs that gave the fries and tots the perfect flavor.

The herbs on the real fries, including the rosemary, were tender, indicating they had been cooked. After testing several methods to soften the herbs for my Smashfries and Smash Tots copycat recipe, I finally settled on blanching the freshly minced herbs in simmering water and then straining them. I rehydrated garlic granules and simmered them in olive oil with the herbs just long enough for the all the water to evaporate. You’ll know that the garlic and herbs still contain water if they clump together in the oil. When they separate, the water has cooked off.

To finish your hack, toss the herb-infused oil you made with crispy French fries or potato tots and dig in. 

Find more copycat recipes for your favorite famous french fries here.