Cut the chicken breasts into bite-sized pieces. Season to taste with salt and pepper
Place the chicken in a bowl and cover it with the lime juice.
In a large pot, saute onions, scallions, and garlic in butter for 3 minutes.
Add the ginger and chicken, stirring constantly until the chicken turns white.
Add the broth, bring to a boil and simmer for about 15 minutes.
Add more salt and pepper if desired.
Serve in individual bowls and sprinkle with lime zest