How to Make It
In a blender, puree the tomatoes with the cucumber, red pepper, vinegar, garlic, Tabasco and cumin. Pass through a fine strainer into a glass measuring cup. Season with salt. Transfer half of the mixture to a small saucepan. Sprinkle the gelatin evenly over the mixture and let stand for 5 minutes. Cook the mixture over moderate heat until the gelatin is melted, about 1 minute. Stir in the remaining tomato mixture. Pour into 4 small glass bowls and refrigerate until firm, about 1 hour.
Meanwhile, clean out the blender, then puree the chopped avocado with the water, lime juice and olive oil. Season with salt. Spoon the avocado cream over each gelée and serve.