Marinate the steak. Pat the steak dry. Mix all the steak ingredients except the meat in a bowl. Coat the steak thoroughly, cover, and refrigerate for 2–8 hours.
Prepare for cooking. Remove the steak from the marinade and let excess drip off. Discard the used marinade. Heat a large cast-iron skillet over medium-high heat until hot, or preheat a grill to medium-high.
Cook the steak. Lightly oil the skillet or grill grates. Cook for approximately 5–8 minutes per side, depending on thickness. Use a meat thermometer to check the thickest part; cook to 145°F, then let it rest for at least 3 minutes. A 5–10-minute rest also gives you time to finish the vegetables.
Cook the vegetables. While the steak rests, heat 1 tbsp olive oil in a skillet. Add the onion and bell peppers. Cook for 5–7 minutes, stirring occasionally, until tender with lightly browned edges. Season with salt and pepper.
Slice and serve. Find the long muscle lines running through the steak and slice thinly across those lines, holding your knife at a slight angle. Serve with the onions and peppers, spooning any resting juices over the meat.
Tip:
Debbie’s serving idea: Pair it with coconut rice and steamed cabbage, or tuck the sliced steak and peppers into warm tortillas for jerk steak tacos.