Sweet potatoes (you can also use potatoes, beets and taro roots)
Peel and thinly slice sweet potatoes. Cut into heart shapes by stacking a few together. Cut out a V at the top, cut off the sides, then round more if needed.
Heat butter and oil in a nonstick pan. Add sweet potatoes. Season with garlic, onion, thyme and salt. Cover with a lid and heat about 15 minutes, stirring occasionally to make sure both sides get cooked through and don't burn. Serve hot.
Save the extra pieces from shaping the hearts and cook in a separate pan or save for another meal.
Baked Potato Style
Poke sweet potato with a fork a few times. Wrap in aluminum foil and bake at 450° for ~60 minutes (time depends on how thick your potato is). When potato is soft, carefully unwrap. Slice in half and cut off edges as shown until potato resembles a heart. (Keep skin there or remove as desired.) Add butter and salt to taste.