Melt the butter in a medium pot over medium-high heat. As the butter begins to turn a caramel color, add the garlic and onions, and stir until they turn soft and slightly brown, about 5-8 minutes.
Place the pot back on the stove, add the mushrooms, and the orange juice. Bring to a boil again and then lower heat to a very gentle simmer. Cover the pot and cook until the mushroom bits are soft, about another 10 minutes. Take the gravy off of the heat, add the herbs, pour into a gravy boat, and serve warm.