In a large sauté pan over medium heat, melt the ghee.

Cook the onion and garlic until the onion is slightly translucent, about 5 minutes.

Add the sweet potatoes to the pan, and give it a good stir to cover all the pieces with ghee.

Season with salt and pepper.

Raise the heat to medium-high, and cook for 15 to 20 minutes, or until the sweet potatoes begin to brown on all sides and get crispy. With about 5 minutes of cooking time left, add the bell pepper.

Serve immediately.