Butternut Squash And Sweet Potato Soup

Ingredients

• 1.2 lb butternut squash (550 grams, peeled and cubed, ½ medium squash)
• 1 lb sweet potato (450 grams, peeled and cubed, 1 large)
• 1 tablespoon olive oil
• 1 onion (diced)
• 1 1/2 celery ribs (diced)
• 3 garlic cloves (roughly chopped)
• 1 teaspoon salt
• ½ teaspoon pepper
• 1 teaspoon curry powder
• ½ teaspoon lemon zest
• 5 cups stock (I use 3 cups chicken + 2 cups veggie)
• 1 tablespoon lemon juice
• Chopped chives
• Extra salt and pepper
• Light cream or sour cream
• Grated Parmesan cheese
• Croutons