Creamy Zucchini Soup with Walnuts and Dill

Bahan-bahan (6 porsi)

• 3 tablespoons extra virgin olive oil, (divided, plus more for drizzling)
• 1 medium yellow onion, (chopped)
• 2 cloves garlic, (cut into quarters)
• 4 medium zucchini, (halved lengthwise and thinly sliced)
• 4 cups chicken broth
• 1 teaspoon salt
• ¼ teaspoon freshly ground black pepper
• 2 tablespoons fresh dill ((or 1 tablespoon dried), plus more for serving)
• ½ cup walnuts, (toasted)
• 3 tablespoons freshly squeezed lemon juice, (from 1 lemon)