cucumber + avocado soup with tomato + basil salad

I was on something of a vacation detox diet last week. All I wanted was fruits and vegetables and fresh tasting meals after my (absolutely wonderful) all-you-can-eat Virginia tour. So I found this recipe from Bon Appetit, and it fit the bill- super fresh, no cooking required, not to mention it pairs two of my favorite things in the world, cucumber and avocado. The thing was made for me. How could I not make it?

Cucumber and Avocado Soup with Tomato and Basil Salad 
adapted from Bon Appétit  | August 2000 

1 large English hothouse cucumber,  peeled, diced (about 2 1/2 cups)

2 1/2 cups low-fat (1%) buttermilk
2 avocados, quartered, pitted,      peeled
1/2 medium red onion, chopped
2 tablespoons chopped fresh basil
1 large seeded chopped tomato
2 teaspoons fresh lime juice
4 tablespoons plain nonfat yogurt

Combine cucumber and buttermilk in blender. Chop 1/2 of one avocado; set aside for salad. Cut remaining avocado into chunks. Add avocado to blender; then add 2 tablespoons red onion and 1 tablespoon basil. Blend until very smooth. Season with salt and pepper. Cover; refrigerate until chilled, about 1 hour.
Mix reserved avocado, remaining 2 tablespoons onion and 1 tablespoon basil, tomato and lime juice in small bowl. (Can be prepared 1 day ahead. Cover soup and tomato salad separately and refrigerate.) Ladle cucumber soup into 4 bowls. Dollop each with 1 tablespoon yogurt; top with tomato salad and serve.