For Caramelized Onions:
2 tablespoons (30 ml) olive oil
3 large sweet onions, sliced
1 teaspoon (6 g) salt
1 tablespoon (15 ml) water
For Seasoned Salt:
3⁄4 cup (225 g) kosher salt
2 tablespoons (26 g) sugar
2 tablespoons (14 g) paprika
1 tablespoon (6.5 g) celery salt
1 tablespoon (9 g) garlic powder
1 tablespoon (6.9 g) onion powder
1 teaspoon (2.2 g) ground turmeric
1⁄2 teaspoon (0.9 g) dried oregano
1⁄2 teaspoon (2.15 g) ground thyme
1⁄8 teaspoon (0.3 g) ground cinnamon
2 1⁄2 pounds (1.14 kg) freshly ground chuck, 80% lean
9 slices deli-style American cheese, quartered
Buttermilk Slider Rolls
647 Secret Sauce (recipe follows)
One 16-ounce (455-g) jar dill pickle chips
Muffin tins with 4-ounce (120 ml) cups (or disposable aluminum muffin tins), enough for 18 sliders
Prepare your smoker or kettle grill and bring temperature to 300°F (150°C). To caramelize the onions: Heat the olive oil in a large, nonstick saute pan over medium-high heat. Add the onions and salt and cook, stirring often, until onions soften and just start to brown. Reduce heat to medium-low and cook, stirring occasionally, until onions collapse completely and turn a rich, jammy brown, about 30 minutes. When onions are nearly done, add the water and stir, scraping the browned bits on the bottom of the pan into the onions. Set aside to cool.
To make the seasoned salt: In a bowl, mix all ingredients together, then grind in a spice grinder.
To make the burgers: Divide the ground beef into 18 golf ball–sized rounds (about 21⁄2 ounces, or 55 g each). Spread about 1⁄4 cup (72 g) seasoned salt on a plate and roll the balls lightly in the seasoned salt to coat. Spread 1 tablespoon (5.5 g) of caramelized onions in the bottom of each muffin cup. Place 1 meatball on top of the onion in each cup and press down with your fingers to form into an even burger.
Put the muffin tins on the grill grate, close the lid, and cook for 30 minutes. Remove the muffin tins, overlap 2 quarter-slices of American cheese on each burger, and tent the muffin tins with foil. If your slider rolls are not fresh from the oven, wrap in foil and place on the smoker for 5 minutes, or microwave for 20 seconds. You want the slider rolls to be soft and squishy inside.
To serve, use tongs to transfer the burgers from the tins to the slider rolls. Then, with the tongs, pick up some of the remaining onions and place on top of the burger. Garnish with a generous schmear of 647 Secret Sauce and pickle chips.
Yield: 18 sliders
647 Secret Sauce
1⁄4 cup (60 g) mayonnaise
1⁄4 cup (35 g) finely chopped dill pickles, drained well
2 tablespoons (30 ml) dijon or spicy brown mustard
2 tablespoons (30 ml) ketchup
1⁄2 teaspoon (2 g) sugar, or more to taste
Freshly cracked black pepper, to taste
This sauce, a favorite on the burgers at Andy’s restaurant, Tremont 647, is great to have on hand any time you’re cooking with fire. This recipe can be doubled easily.
In a bowl, mix all ingredients together. Cover and chill. Before serving, taste to correct seasoning with sugar and pepper. The sauce will keep, covered tightly and refrigerated, for up to 2 months.
Yield: 3⁄4 cup (175 g)
Excerpted from Wicked Good Barbecue (Fair Winds Press, 2015)