Add onion and garlic, chop 4 seconds, Speed 5. Scrape down the sides of the bowl.
Add butter and cook 4 minutes, 100 degrees, Speed Soft (spoon).
Add carrot, pumpkin, sweet potato and liquid vegetable stock. Cook with the MC on for 20 minutes, 100 degrees, Speed 1. *Do not exceed the max line at any stage.
Check if the vegetables are cooked by inserting a fork into the centre - they should be soft and fall apart.
Allow to cool and then blend for 30 seconds, slowly increasing to Speed 7.
Reheat the soup before serving (3 minutes, 100 degrees, Speed 2).