GYOB Griddle Burger with DijOli

Name: GYOB Griddle Burger with DijOli
Ingredients: 2 pounds English-cut short ribs, boned and meat cut into 1-inch chunks; Kosher salt and freshly ground black pepper; 12 slices white American cheese; Unsalted butter, at room temperature, for buttering the buns; 6 fresh pretzel buns, split; Sliced pickled jalapenos, for topping; DijOli, recipe follows; 1/2 cup mayonnaise; 1/2 cup Dijon mustard; 2 tablespoons stone-ground mustard; 1 tablespoon honey; 1/2 clove garlic, grated on a rasp grater