01 - Heat a large skillet or wok over medium-high heat. Add the ground beef and cook, breaking it up with a spatula, until browned and cooked through, about 5–6 minutes. Drain excess fat if necessary.
02 - Add the garlic and ginger to the pan; stir-fry for 1 minute until fragrant.
03 - Stir in the carrot, bell pepper, and half of the spring onions. Cook for 2–3 minutes until just softened.
04 - Add the soy sauce, hoisin sauce, oyster sauce, sesame oil, and chili sauce. Mix well and cook for another 2 minutes.
05 - Stir in the cashews and cook for 1 minute, just to warm them through.
06 - Remove from heat. Taste and adjust seasoning if necessary.
07 - To serve, spoon the beef mixture into the lettuce leaves. Top with remaining spring onions and fresh coriander. Serve with lime wedges on the side.