As I mentioned in the Ingredients section above, you can use any type of tomato you enjoy. Some good options would be beefsteak tomatoes, heirloom tomatoes, or tomatoes on the vine. If you want, you could even use cherry tomatoes cut in half. But, whatever type of tomato you choose, try to find ripe tomatoes. If the tomatoes are not ripe, the salad won't be nearly as flavorful.