Preheat oven to 350 degrees. Season fish filets with salt and pepper. Heat a large cast iron or heavy bottomed skillet over moderately high heat. When hot add 2-3 tablespoons of olive oil. Sear fish fillets about 1-2 minutes per side or until lightly golden, remove to a oven proof platter and set in oven to finish cook for 3-5 minutes or, to desired doneness. Meanwhile add the remaining olive oil, slivered garlic, salt and pepper to the pan and cook over medium low heat stirring often for about 2 minutes. Add chopped ancho chiles and continue cooking a minute or two until a toasty aroma is released. Add the fish stock or clam juice reduce by half, adding any juices that have collected on the platter holding the fish fillets. Then add lime juice and parsley, bring sauce to a boil and pour over fish on platter. Serve immediately along with plenty of white rice.
TOMATO RELISH FOR GRILLED FISH
Combine all the ingredients in a pot, cover and simmer about 1 hour. Set aside to cool to room temperature. Tomatillo relish can be stored in the refrigerator up to a week. To serve, line a large platter or serving plates with relish and top with grilled fish fillets. Or serve as a condiment with cold meats. Garnish with scallions.