Heat oil in a heavy stock pot and sauté macadamias, onions and ginger for 2 – 3 minutes. Stir in apple and pumpkin slices and sauté for 2 – 3 minutes (if substituting canned pumpkin puree, add only the apple in the step above and use pumpkin puree when you add chicken stock). Pour in chicken stock. Bring to a boil then cover and simmer for 20 minutes or until apples/pumpkin become soft. Transfer to blender and blend until smooth.