Make a marinade with the soy sauce, rice vinegar and cayenne. Add the shrimp and marinate for at least 30 mins.

Dry fry the Chinese five spice in a large skillet over a low heat for a few minutes.

Add enough oil to cover the base of the pan, and turn up the heat to medium.

When the oil is warm, use a slotted spoon to transfer the shrimp to the pan. Discard the marinade. Cook for a few minutes on each side, turning once and seasoning with salt and pepper.

Transfer the cooked shrimp to a serving platter and garnish with extra salt and pepper, plus the green onions and chilies, if using.