Dump the broth, onions, garlic, and thyme into a medium saucepan and bring to a boil on high. Then, lower the heat to low and let it simmer for ~30 minutes or until the onions and garlic are really soft. At this point, taste for seasoning and add salt, pepper, and coconut aminos.
Pour everything into a blender (I love my Vitamix!), add the ghee, and blitz everything until it's a smooth consistency. You can even add heavy cream if you can tolerate it and want a creamy gravy.