Zucchini and Rosemary Soup

Bahan-bahan (8 porsi)

• 2 tablespoons butter
• 1 tablespoon vegetable or canola oil
• 1 large onion, (chopped)
• 2 medium garlic cloves, (sliced)
• 2 teaspoons minced fresh rosemary
• 4 cups low-sodium, fat free chicken or vegetable broth
• 1 medium russet potato, (peeled and sliced)
• 3 medium zucchini, (thinly sliced)
• 1 medium zucchini, (cut into ½-inch cubes)
• chopped green onions for topping, (optional)