Leek, potato and rosemary soup | Tesco Real Food

Ingredients

• 50g unsalted butter
• 1 small onion, roughly chopped
• 2 tbsp finely chopped rosemary
• 3 leeks, finely chopped
• 3 garlic cloves, sliced
• 550g floury potatoes, peeled and cut into 2cm cubes
• 1 chicken or vegetable stock cube, made up to 800ml
• 200ml semi skimmed milk
• 6 slices prosciutto, torn into strips (optional)
• 2 tbsp chives, to garnish