Preparing the Broth: Ensure the beef broth is well-chilled by refrigerating it for several hours or overnight. For a more gelatinous broth, use bones with a high collagen content when making your broth.
Mixing: In a large mixing bowl, combine the chilled beef broth and heavy cream. Whisk together until well blended.
Adding the Meat: Stir in the finely diced cooked beef or chicken, ensuring the pieces are small enough to be easily spooned up in the soup.
Seasoning: Season the mixture with salt, and if using, black pepper. Adjust the seasoning according to your taste preferences.
Chilling: If the mixture has warmed due to handling, return it to the refrigerator to chill until it's thoroughly cold.
Serving: Once chilled, stir the "gazpacho" well and ladle it into bowls. Serve cold as a refreshing and nourishing summer soup or appetizer.