Remove the skin and bones from the turkey thigh. Thinly slice the turkey and cover it with the marinade for at least 20 minutes, or preferably overnight.
Cut onion, red pepper and asparagus into strips of similar length.
Dice the garlic.
Heat a wok or frying pan with the grapeseed oil over high heat.
Add the garlic and onion and toss until fragrant.
Add the turkey along with some cooking wine. Toss until turkey is half cooked, then add the asparagus and red pepper.
Add hoisin sauce and cashews to the pan and mix together.