In a countertop blender, combine avocados, scallions, lime juice, and water and puree until very smooth. Season with salt and pepper. Stir in tomatoes.
Put 1/4 cup of kimchi in a bowl and pour avocado soup around it. Sprinkle with chia seeds.
Recipe excerpted from Soup Cleanse Cookbook provided by Nicole Centeno, founder of Splendid Spoon