Toast the sesame seeds: Spread sesame seeds on a baking tray and toast in the oven for 5–8 minutes, or until golden. Set aside.
Prep the garnishes: Roughly chop the cashew nuts and finely dice the spring onion. Set both aside for topping.
Cook the vegetables: Finely dice the carrot, onion, pepper, courgette, garlic, and ginger. Add to a pan with a little oil and cook for 5–8 minutes until softened. Remove from the pan and set aside.
Cook the turkey: Add the turkey mince to the same pan and cook until browned, breaking it up as it cooks.
Combine: Return the cooked vegetables to the pan. Stir in the chopped coriander and teriyaki sauce. Simmer for a few minutes until bubbling and well combined.
Assemble: Spoon the teriyaki turkey mixture into baby gem lettuce leaves.
Garnish & serve: Top with toasted sesame seeds, chopped cashews, and spring onions. Serve immediately.