Return pan used to cook chicken to medium-high heat. When pan is very hot, carefully add 1 Tbsp. olive oil, tomatoes and minced jalapeños (to taste). Cook undisturbed until lightly charred, 1-3 minutes. Remove from burner and stir in lime juice, half the cilantro (reserve remaining for garnish), half the zest (reserve remaining for garnish), 1/4 tsp. salt, and a pinch of pepper.