Sauté onions and carrots: Melt the butter (or ghee) in a soup pot over medium heat and cook the onions and carrot, stirring occasionally, until the onions soften (5 to 8 minutes). Do not let the onions or carrots brown. Sprinkle a teaspoon of salt over the carrots and onions as they cook.
Add stock and water, ginger, and strips of orange zest. Bring to a simmer, cover, and cook until the carrots soften (approx. 20 minutes).
Remove the strips of orange zest and discard.
Purée soup by pouring small amounts into a blender at a time, and purée until completely smooth. (Fill the blender bowl a third full and keep one hand pressing down on the cap of the blender to keep it from popping off.)
Add more salt to taste.
Garnish with chopped chives, parsley, or some other herb of choice