HEAT ABOUT A TABLESPOON OF OLIVE OIL IN A PAN, SAUTE GARLIC, ONION, COOK FOR A MINUTE OR UNTIL ONIONS ARE TRANSPARENT. ADD THE DICED TOMATOES, SEASON WITH SALT AND PEPPER SAUTE UNTIL TENDER, THEN ADD TOMATO PASTE (IF USING) AND WATER AND FISH SAUCE.
ADD IN THE GREEN CHILIS. BRING TO A BOIL AND LOWER HEAT TO SIMMER UNTIL THE TOMATOES ARE REALLY SOFT, YOU CAN MASH THE TOMATO USING THE BACK OF A WOODEN SPOON OR POTATO MASHER TO SPEED UP THE COOKING TIME.
ADD THE FRIED FISH AND COOK FOR ABOUT 2-3 MINUTES ON EACH SIDE. TURN OFF HEAT AND TRANSFER TO A SERVING PLATTER.
SERVE WITH HOT STEAMED RICE