Creamy Celery Soup

Bahan-bahan (4 porsi)

• 3 tablespoons butter
• 1 yellow onion (chopped)
• 4 cups chopped celery (½-inch thick)
• 1 small potato (peeled, chopped ½-inch, about 1 cup)
• 3 cups chicken broth
• ¼ cup heavy whipping cream
• 1 teaspoon fresh lemon juice
• salt and black pepper (to taste )
• 2 teaspoons chopped fresh parsley (more for garnish, if desired)
• garnishes (as desired, see notes)