1In a bowl, combine chicken, crumbs, coriander, onion, lemongrass, fish sauce and ginger. Shape into 10 patties. Chill 10 mins.
2LIME MAYO: In a bowl, combine all ingredients. Set aside.
3In a large frying pan, heat oil on medium. Fry patties in batches, 2 mins each side, until golden and cooked through. Drain.
4Meanwhile, steam or microwave buns following packet instructions.
5Top with patties, a dollop of lime mayo, cucumber and a drizzle of sriracha, plus a sprig of coriander.