In a mixing bowl, combine the warm water and active dry yeast. Let it sit for about 5 minutes until it becomes frothy.
Add the vegetable oil, beaten egg, and sugar to the yeast mixture. Stir well to combine.
In a separate bowl, whisk together the salt and 3 cups of all-purpose flour. Gradually add this to the wet ingredients until a soft dough forms.
Knead the dough on a lightly floured surface for about 5 minutes until smooth and elastic.
Place the kneaded dough in a greased bowl, cover it with a kitchen towel, and let it rise in a warm place for about 15 minutes.
Punch down the risen dough and divide it into 8 equal pieces, shaping each into a round bun.
Brush the tops of the buns with an egg wash (egg yolk mixed with water) and sprinkle sesame seeds on top.
Preheat the oven to 375°F (190°C) and bake the buns for 15-20 minutes until golden brown.
Let the baked buns cool on a wire rack before slicing and serving.
