How to Make It
Season the chopped tomatoes with 2 teaspoons of kosher salt and let stand at room temperature for 1 hour.
In a blender, puree the tomatoes. Strain the puree through a coarse sieve set over a bowl. Stir in the buttermilk. Season the soup with salt and pepper and refrigerate until chilled, at least 30 minutes.
In a bowl, toss the cherry tomatoes with the basil, parsley, scallion, oil and lemon juice. Season with salt and pepper.
Ladle the soup into shallow bowls. Spoon the cherry tomato salad in the center of each soup and serve.