01
Combine vinegar, miso paste, brown sugar, cayenne pepper, and garlic in a small bowl. Stir until smooth.
02
Spread miso mixture generously on both sides of skirt steaks. Sprinkle with black pepper. Allow to rest at room temperature for about 30 minutes.
03
Prepare a charcoal grill for medium-high heat. Place steak on the grill and cook without moving for about 2 minutes. Turn steaks 180 degrees to create cross-hatch grill marks, and cook another 2 minutes. Flip steaks and continue cooking until medium-rare to medium on the inside, and shiny on the outside, about 4 more minutes. An instant-read thermometer inserted into the centre should read 57°C. Allow to rest for 5 minutes.