Whats even crazier is the ethnobotanical path to GET those ingredients together.
Tomatoes had to be brought from south america. Bred to grow at lower altitudes. Peasants had to be persuaded to eat them (they were formally animal feed because they were from the nightshade family and peasants didn't trust the fruit not to be poisonous since the leaves are) and then enough time (100 years) had to pass for them to develop cuisine around them.
That's common in California, too. Watermelon, feta and a little bit of lime juice is a frequent summer salad.