Preheat the oven to 400 degrees Fahrenheit. Score the skin of the duck breasts. Season the duck breasts on both sides with the 5 spice and a pinch of salt and pepper. Heat a skillet over a medium/high heat. Place the duck breast skin side down in the dry skillet. Cook for 5 minutes or until the skin is golden brown. Turn the duck over and cook the other side for just a minute to seal. Place the duck breasts on an oven tray, leaving any fat behind in the skillet. Bake for 10-12 minutes or until cooked through to preference. Once cooked, set aside to rest for 5 minutes.
While the duck is cooking, drain the noodles and rinse thoroughly under cold water. Heat a separate dry skillet over a medium heat. Add the noodles and cook for 6-7 minutes or until hot through and firm.
While the noodles are cooking, thinly slice the garlic and scallion and grate the ginger. Add the olive oil to the skillet used to cook the duck and set over a low/medium heat. Add half the scallion, garlic and ginger. Sweat gently for a minute or two until tender and fragrant.
Add the noodles to the skillet along with the orange juice, sesame oil, and tamari sauce. Stir well to combine, coating the noodles in the sauce. Heat through briefly.
Divide the noodles between two serving bowls. Slice the duck breasts and arrange over the top of the noodles. Scatter over the remaining scallions. Serve hot.