1. Prepare the Dough

In a small bowl, dissolve the yeast in warm milk and let it sit for 5-10 minutes until foamy. In a large mixing bowl, combine the sugar, eggs, softened butter, and salt. Gradually add the flour and the yeast mixture, mixing until a soft dough forms.

2. Knead and Let Rise

Turn the dough onto a floured surface and knead for about 5 minutes until smooth and elastic. Place the dough in a greased bowl, cover with a clean kitchen towel, and let it rise in a warm place for 1-1.5 hours or until doubled in size.

3. Shape the Donuts

Once risen, roll the dough out to about ½-inch thickness. Use a sharp knife or pastry cutter to cut the dough into rectangular or oval shapes, approximately 4 inches long. Transfer the shaped pieces to a parchment-lined tray and cover them with a towel. Allow them to rise for another 30 minutes.

4. Fry the Donuts

Heat oil in a deep fryer or large pot to 350°F (175°C). Carefully lower the donuts into the hot oil, frying 2-3 at a time. Cook for about 1-2 minutes per side, or until golden brown. Use a slotted spoon to transfer the donuts to a cooling rack.

5. Add Glaze or Fillings

Prepare a simple glaze by mixing powdered sugar with milk and vanilla extract. Dip the tops of the cooled donuts in the glaze or drizzle it over them. For filled donuts, use a piping bag to inject custard, whipped cream, or jam into the center of each donut.

6. Serve and Enjoy

Allow the glaze to set before serving. Pair your homemade long john donuts with a cup of coffee or hot chocolate for the perfect treat.