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Export 7 ingredients for grocery delivery
Step 1
Whisk together garlic, extra-virgin olive oil, balsamic vinegar, gluten free soy sauce, and Worcestershire sauce in a medium bowl or baking dish. Season with freshly ground black pepper. Whisk in baking soda. The baking soda will cause the marinade to fizz.
Step 2
Prick London Broil all over with a fork. Pour marinade over the London Broil and turn to coat. Let sit at room temperature at least 1 hour or cover and chill till the next day. Flip London Broil occasionally in the marinade.
Step 3
Season steak generously with kosher salt and place on a preheated grill on medium-high heat. Cook, turning once, until deeply browned on both sides, approx 12-14 minutes total for medium-rare OR until an instant-read thermometer inserted into thickest part registers 125° for medium-rare. Cook 1-2 minutes longer for medium. Transfer to a cutting board and let rest 10 minutes.
Step 4
Meanwhile, transfer reserved marinade to a small saucepan, add water, and bring to a boil (mixture will foam). Cook over medium heat, stirring constantly to avoid overflow, until foaming begins to subside, about 3 minutes. Add butter and whisk vigorously to emulsify sauce. Keep warm until ready to serve.
Step 5
Thinly slice steak against the grain and arrange on a platter. Spoon sauce over London Broil and garnish with parsley, scallions, and/or chives.