Creamy Cucumber Velouté

Name: Creamy Cucumber Velouté
Ingredients: 1 pound European cucumbers, cut into 1/2-inch pieces; 3/4 cup plain whole milk yogurt; 1/4 cup water; 1 tablespoon fresh lemon juice; Pinch of curry powder; Pinch of cayenne pepper; 2 teaspoons crème fraîche or sour cream; Salt and freshly ground white pepper; 1/4 cup heavy cream; 16 small mint leaves