In a baking dish, combine the fish, salt , pepper and lime juice. Use enough juice to cover the fish and allow it to marinate over night; cover and refrigerate. (You know it's ready when the fish cube no longer looks raw when cut in half. Drain in a colander.
In a large bowl, mix together the fish, tomatoes, green peppers, cilantro, lime juice, olive oil, salt and pepper.
Place the ceviche into individual plates to eat with roasted corn tortillas. Garnish the ceviche with cilantro leaves before serving.