Sweet & Regular Potatoes w/Onions

"My father used to make this with leftover sweet and white potatoes. He would add sliced onions to the mix. And he would fry it all up with bacon grease. But use margarine or vegetable oil for a healthier version. He would season with salt and pepper to taste. But I also like to add crushed red pepper to spice things up some. Just a good use of leftovers. Plus the sweet potatoes would actually sweeten up more when they are fried. But remember not to use high heat. Or else they will burn. Slow and easy makes it delicious!"