Green Beans and Zucchini with Sauce Verte

Name: Green Beans and Zucchini with Sauce Verte
Ingredients: 1/3 cup (packed) fresh basil leaves; 1 green onion, coarsely chopped; 2 tablespoons (packed) fresh Italian parsley; 2 tablespoons drained capers; 1 tablespoon fresh lemon juice; 2 teaspoons Dijon mustard; 1 garlic clove, peeled; 3 tablespoons extra-virgin olive oil; 1 tablespoon olive oil; 1 pound green beans, stem end trimmed; 12 ounces zucchini, halved lengthwise, each half cut lengthwise into 1/3-inch-wide strips; 3 tablespoons water; 2 tablespoons fresh Italian parsley leaves (for garnish)