Peal & finely chop the onion & garlic.
Heat the oil in the pressure cooker then add all the Stage 1 ingredients. Mix well together and cook for about 5 minutes over a low heat - stirring occasionally.
Meanwhile peel & roughly chop the squash, sweet potatoes and carrots.
Add all the Stage 2 ingredients and stir well to cover with the liquid. Put on the lid, bring up to pressure & cook for 10 minutes.
Allow to the pressure cooker to cool by itself then remove lid. Use a blender to create a potage and serve with crusty bread.