Lean grilled flank steak marinated and sliced against the grain is a high protein, healthy option for family dinners. This versatile cut supports clean eats and works beautifully in a calorie deficit meal plan.
In a large resealable bag, combine olive oil, soy sauce, balsamic vinegar, minced garlic, black pepper, and kosher salt to make the marinade, mixing well.
Place the flank steak in the marinade. Seal and refrigerate for at least 2 hours, preferably up to 8 hours, turning once for even flavor absorption.
Preheat a grill to high heat (about 450°F). Remove steak from marinade, let excess drip off, and pat surfaces dry for proper searing.
Grill the steak over direct heat for about 4-5 minutes per side, using tongs to flip only once for clear grill marks and optimal caramelization.
Check for doneness at the thickest part with an instant-read thermometer (target 130°F–135°F for medium-rare). Transfer to a cutting board, tent with foil, and rest 8 minutes before thinly slicing against the grain.