Steak Tacos with Kimchi and Gochujang Mayonnaise

Name: Steak Tacos with Kimchi and Gochujang Mayonnaise
Ingredients: 3 tablespoons soy sauce; 2 tablespoons plus 2 teaspoons toasted sesame oil; 1 tablespoon packed light brown sugar; 3 cloves garlic, finely chopped; 1 1-pound skirt steak, cut crosswise into thirds; Vegetable oil, for the grill pan; 1 bunch scallions; 1/3 cup mayonnaise; 2 teaspoons gochujang (Korean red chile paste) or Sriracha, plus more to taste; 1 cup kimchi, cut into strips; 1 firm pear, finely chopped; 12 6-inch corn tortillas; 2 cups mixed Asian greens (2 ounces) or other lettuce