Place noodles in a heatproof bowl and cover with boiling water. Set aside to soak for 10 minutes or until soft. Drain and rinse well.
Combine garlic, ginger, soy, oyster sauce and water in a small jug.
Heat oil in a frying pan on medium. Add turkey and cook, stirring to break up any lumps, for 5 minutes or until brown. Add garlic and ginger mixture and simmer for 1-2 minutes until turkey is well coated.
Fill lettuce cups with noodles and turkey mixture. Top with carrot, cucumber, herbs, onion, chilli, crunchy shallots and cashews. Serve with lime wedges.