This soup blends velvety celeriac with the bold, peppery notes of fresh watercress. The celeriac provides a smooth, creamy texture, while the watercress adds a bright and slightly spicy finish. The result is a balanced, nutrient-rich soup that’s both comforting and refreshing.
Sauté the vegetables: Heat the butter or olive oil in a large pot over medium heat. Add the chopped onion, leek, and garlic, and cook for 5 minutes until softened.
Add the celeriac: Stir in the chopped celeriac and cook for another 5 minutes, allowing the flavors to meld.
Pour in the stock: Add the vegetable or chicken stock, season with salt and black pepper, and bring to a gentle simmer. Cover and let cook for 20 minutes, or until the celeriac is tender.
Blend the soup: Remove the pot from heat and stir in the watercress. Let it wilt for 1-2 minutes. Use an immersion blender to blend the soup until smooth, or transfer it in batches to a blender. If you prefer an extra silky consistency, pass the soup through a fine sieve.
Add cream (optional) and adjust seasoning: Stir in the double cream for extra richness, and adjust seasoning as needed. Add a splash of lemon juice for brightness.
Serve: Ladle the soup into bowls, garnish with fresh watercress leaves, and serve with crusty bread or croutons.