My mom learned how to make this from a local of Guadalajara Mexico. It is very simple to make and quite delicious! It's always a big hit when I have guests over. Great for a margherita party! Serve with tortilla chips (try recipe #263512). Out of necessity, I have omitted the tomatoes and it still tastes great. I have also added a few tbsps of fresh chopped cilantro when I have it on hand.