Melt the ghee in a skillet over medium heat. Add the sweet potatoes and onions, season with salt and pepper and cook, stirring, until the onion is tender, about 5 minutes. Stir in the sage. Cover and cook for 7 minutes.
Transfer the sweet potato mixture to a bowl and set aside. Add the steak to the hot skillet, season with salt and cook, stirring occasionally, for 2 to 3 minutes.
Return the sweet potato mixture to the skillet and stir to combine. Add the kale; season with salt. Spread the hash evenly in the skillet and crack four eggs on top. Cover and cook until the eggs are done to your taste, 7 to 10 minutes. Taste and season with salt and pepper. Serve hot.