This is an easy donut recipe that can be made in a frying pan without using an oven. By mixing butter, sugar, water, all-purpose flour, and eggs to make a batter and then frying it in oil, you can create donuts that are crispy on the outside and fluffy on the inside with a hollow center. The key to creating the hollow center of the donut is to thoroughly fry the batter in the pan. Sprinkling granulated sugar on top at the end makes for a nostalgic and delicious snack. It's easy enough for beginners to try and is perfect for a home café experience.