Directions

1. Heat broiler, with rack set 4 inches from heat. Line a rimmed baking sheet with aluminum foil; set aside. In a small bowl, whisk together lime juice, vinegar, oils, red-pepper flakes, and garlic.
2. Pierce steak all over with a fork; place in a shallow dish or resealable plastic bag. Pour soy sauce and half of lime-juice mixture over steak (reserve remaining half for dressing), and marinate at room temperature, 10 minutes (or up to overnight in the refrigerator).
3. Lift steak from marinade (discard marinade), and place on prepared baking sheet. Broil, without turning, until medium-rare, 8 to 10 minutes. Let rest 5 minutes. Slice thinly on the diagonal, across the grain.
4. In a large bowl, toss cabbage and cucumber with reserved dressing; divide among four plates. Top salad with steak and peanuts.