Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      medium        spanish onion -- cut 1/4" dice
   1                    red bell pepper -- cut 1/4" dice
   1                    green pepper -- cut 1/4" dice
   8      tablespoons   extra-virgin olive oil -- divided
   2      tablespoons   sherry vinegar
   1      teaspoon      honey
   1      teaspoon      crushed red chilies
   1                    scallion -- thinly sliced
   1      pound         vine-ripened tomatoes -- cut 1/2" cubes
   2      pounds        mackerel
                        salt -- to taste
                        freshly-ground black pepper -- to taste

Preparation:

Preheat grill or broiler. In a mixing bowl, place onion, peppers, 6 tablespoons olive oil, vinegar, honey, crushed chilies, scallion and tomatoes, stir well and let stand 1 hour. DO NOT ADD SALT YET! Fillet mackerel and remove all bones, leaving skin intact. Brush fish with remaining extra-virgin olive oil and place skin-side down on grill until almost fully cooked through, about 4 to 5 minutes. Turn over and finish cooking, 1 minute, and place on platter. Season tomato mixture with salt and pepper and spoon over fish. Serve either warm or at room temperature. Source: MEDITERRANEAN MARIO with Mario Batali From the TV FOOD NETWORK - (Show # ME-1B18)