Roasted jerusalem artichoke soup - 9Kitchen

Ingredients

• 600g jerusalem artichokes, peeled and cut into even chunks
• 500g sweet potato, peeled and cut into even chunks
• 60g butter
• 1 onion, sliced
• 1 clove garlic, thinly sliced
• 1 stick celery, finely chopped
• 1.75 litres chicken stock
• salt and pepper
• ½ cup cream
• chives, to serve