Salsa Criolla (Chopped Tomato Salad) without greens

1/4 cup olive oil 1 tablespoon red wine vinegar 1 small yellow onion , diced peeled 4 large ripe tomatoes , diced cored 1 green bell pepper , diced, seeded,[...]

2 red onions , sliced in very thin half moons 1 -2 aji bell peppers or 1 -2 jalapeno pepper, sliced into very thin matchsticks 1 tablespoon chopped cilantro[...]