For the best flavor, use ripe, in-season heirloom tomatoes. Feel free to adjust the amount of lemon juice and salt to your preference. If you don't have buttermilk, you can substitute with regular milk mixed with a teaspoon of lemon juice or vinegar. Try using different varieties of heirloom tomatoes for a colorful and flavorful salad. Serve with crusty bread for sopping up the delicious dressing. Fresh basil leaves can be added as garnish.