Cream of celery soup

WHAT YOU'LL NEED

• 25 grams Flora Buttery
• 125 grams celery sliced (retain the leaves for garnish)
• 1 onion sliced
• 125 grams celeriac peeled diced
• 1 clove garlic crushed
• 1 small potato peeled diced
• 1 Knorr Vegetable Stock Cube
• 100ml Elmlea Double (or, for a lower-fat option use Elmea Double Light or Emlea Single) 100 millilitre Elmlea Double (or for a lower fat option use Elmlea Double Light or Elmlea Single)
• black pepper to taste
• pinch nutmeg