Cucumber Herb Buttermilk Soup

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Ingredients

1 1/2 pounds cucumbers (2 large), peeled, seeded and roughly chopped, plus thin slices for serving
4 large radishes
2 cups buttermilk
3 tablespoons chopped dill
3 tablespoons chopped mint
3 tablespoons chopped basil
3 tablespoons chopped cilantro
1 garlic clove
1 teaspoon salt, plus more to taste
1/4 teaspoon pepper, plus more to taste
extra-virgin olive oil for serving
toasted sourdough slices, for serving