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Ingredients
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Beef and Marinade
Garnish & Serving
Method
Beef and Marinade
Prepare the beef
If not already thinly sliced, trim excess fat and freeze the steak for 20–30 minutes to firm it, then slice across the grain into 1/8–1/4-inch (3–6 mm) slices. This yields tender grilled pieces.
Make the marinade
In a bowl, combine 1 tbsp soy sauce, 1 tbsp fish sauce, 1 tbsp brown sugar, 1 tbsp vegetable oil, 1/2 tsp sesame oil, minced garlic, minced shallot, finely chopped white lemongrass (if using), 1/2 tsp freshly ground black pepper, and 1 tsp sugar (optional). Whisk until sugar dissolves and the mixture is homogeneous.
Marinate the beef
Add the sliced beef to the marinade and toss to coat thoroughly. Cover and refrigerate for at least 30 minutes and up to 4 hours. For best flavor and slight caramelization, allow at least 2 hours.
Prepare for grilling
Remove the beef from the refrigerator 20 minutes before cooking to come toward room temperature. Preheat a grill or grill pan to high heat (about 450–500°F / 230–260°C). Brush the grate or pan lightly with oil to prevent sticking.
Grill the beef
Thread slices onto skewers (optional) or place directly on the hot grill/pan in a single layer. Grill 1–2 minutes per side for thin slices, until edges char and meat is just cooked through. Avoid overcooking to keep meat tender. If using a grill pan, press lightly to maximize contact. Work in batches to avoid crowding.
Finish and rest
Transfer grilled beef to a plate and let rest 2–3 minutes. If desired, squeeze a little lime over the top and sprinkle the optional extra sugar while the meat is hot to encourage light caramelization.
Garnish & Serving
Assemble and serve
Arrange grilled beef on a platter or individual plates. Top with thinly sliced red onion, fresh cilantro leaves, and chili flakes or sliced fresh chili to taste. Serve with lime wedges and steamed jasmine rice if desired.
Notes: Bo Cuan is best eaten hot off the grill. Leftovers can be chilled and used in salads or sandwiches; reheat briefly to avoid toughness.