Winter Beet Soup

Ingredients

• 2 tbsp butter
• 4 None beetroots, peeled and diced
• 2 None carrots, peeled and chopped
• 1 None medium potatoes, peeled and chopped
• 1 None onion, diced
• 1 litre vegetable stock
• 20 g piece horseradish, grated (1-2 tbsp hot horseradish sauce could be substituted)
• 1 tsp lemon juice
• 100 g creme fraiche