In a high-speed blender, add the cucumber, avocado flesh, cilantro, yogurt, lime, olive oil, garlic, 1 teaspoon salt, and cumin. Blend on high until totally smooth.
The thickness of your smoothie will depend on the size of both your cucumber and avocado. The soup should be “soup” consistency, not gloppy. Start by adding ½ cup of water, blend, and continue to add more water until it reaches your desired consistency.
IMPORTANT! Taste and add more salt or lime, if needed. Depending on how much water you added, you will likely need to add more salt. When I made this, I used 1 cup water and a total of 1 ½ teaspoons salt. Use your taste buds!
Serve chilled and topped with chopped cucumber, toasted seeds, a drizzle of olive oil and black pepper, if desired.