Double-line a rimmed baking sheet with foil. Preheat the oven to 400 degrees/ gas mark 6.
In a large mixing bowl, whisk together soy sauce, honey, garlic, sesame oil, and the sriracha sauce. Add chicken wings and toss to coat. Marinate for 1 hour (or overnight).
Remove wings from marinade and spread in a single layer on foil-lined baking sheet. Reserve marinade. Bake wings for 35 minutes, brushing with sauce twice (after 10 minutes and 20 minutes but not during last 10 minutes of cooking).
Boil remaining marinade over high heat until thick and syrupy. Toss with chicken wings. Sprinkle with chopped spring onions and serve.