How to Make It
In a food processor, combine the cilantro, mint, garlic, ginger, chiles and lime juice and process until smooth. Transfer to a bowl and stir in the butter, cumin, black pepper, cloves and 1 teaspoon of kosher salt.
Set the chickens breast side down on a large rimmed baking sheet. Spread with some of the herb butter. Turn the chickens over and splay them out. Loosen the skin on the breasts and legs and spread some of the butter on the chicken underneath the skin. Rub the remaining butter over the top of the skin. Cover and refrigerate for 4 hours.
Preheat the oven to 425°. Let the chickens stand at room temperature for 20 minutes.
Roast the chickens in the upper third of the oven for about 1 hour, until they are richly browned and the juices run clear when a thigh is pierced. Transfer the chickens to a carving board and let rest for 10 minutes.
Pour the pan juices into a glass measuring cup and skim the fat from the surface. Carve the chickens and serve with the pan juices.
The cilantro and mint butter can be refrigerated overnight.