Make the Sponge: Add 1/4 cup of flour, yeast and 2 tablespoons of warm water to a small bowl. Mix well and set aside for 10 minutes.
Make the Dough: Melt butter and place in a large mixing bowl with pineapple juice, brown sugar and vanilla. Add 2 whole eggs plus one egg yolk, reserving 1 egg white in a small bowl for brushing the round loaf. Mix well.
Add 3 1/4 cups of flour, salt and the sponge. Mix with a dough whisk or wooden spoon until dough pulls away from the sides of the bowl and comes together into a ball. Add additional flour if needed 2 tablespoons at a time.
Knead the Dough: Flour a clean surface. Pour the dough onto the lightly floured surface and knead for 4-5 minutes, adding more flour 1 tablespoon at a time until dough is a smooth ball.
Dough Rise: Grease a large bowl and place dough into the bowl, turning to coat. Cover with a bowl cover or plastic wrap and place in a warm place to rise for 2 hours.
Punch down the dough, kneading out the excess air bubbles. Line a rimmed baking sheet, round cake pan or a pizza pan with parchment paper.
Shaping the Dough: Shape the dough into a round loaf and place onto the prepared pan.
Second Rise: Cover the bread dough with a damp tea towel and set in a warm place to rise, about an hour or until doubled in size.
Beat the egg white and brush over the loaf.
Baking: Bake in a preheated 350° oven for 35-40 minutes or until loaf reaches 190° using an instant-read thermometer. If loaf is getting too brown, cover lightly with aluminum foil for the remaining baking time.
Remove from oven and place on a wire rack to cool slightly.
Serve warm or at room temperature.