Preparation

1. In a small bowl, whisk the marinade ingredients, to combine.
2. Place chicken breasts into a zip-seal bag and pour marinade over them. Refrigterate. Allow chicken to marinate four to six hours or overnight.
3. To cook, preheat broiler or grill. Place chicken onto broiler pan, if broiling, about 4 inches from the element. Cook chicken about 5 minutes per side until golden and the internal temperature reaches 160 F. on an instant read meat thermometer. Chicken will generally cook more quickly on the grill.
4. In the bowl of a food processor puree the tomatillos, pepper, shallot, garlic, water, and salt. Transfer to a heavy saucepan and bring to a boil; lower the heat and allow to simmer until slightly thickened, about 10 - 15 minutes. Transfer to a bowl and cool to room temperature. Stir in cilantro, lime zest, and lime juice. Taste and adjust seasoning as desired.