Saute chiles and scallions in oil in a large pan over medium-high heat for 4 to 5 min. Stir in whole garlic cloves and saute for 3 to 4 more min., stirring occasionally. Remove from heat and allow to cool.
Place cooled sauteed vegetable mixture into a food processer with cilantro and pulse 3 to 4 times to combine. Add salt, chicken stock and lime juice and pulse 3 to 4 times to a slightly finer consistency, but do not allow the chiles to be pulsed down smaller than 1/8-inch in size. Place chile mixture in a small saucepan and bring to a boil over a medium-high heat. Cover and reduce to a simmer and cook for 10 to 12 min.
Serve over rice and garnish with diced tomatoes or with our Chicken Cordon Peru.