Place a small saucepan of water and diced potatoes in it. Turn the heat to high. Potatoes should be fork-tender after boiling for at least ten minutes. After draining and mashing the mixture well, leave it to cool. To get a smooth and silky mash, make sure your potatoes are cooked through.
To bring milk's temperature to around 90 degrees, microwave it for 15 to 30 seconds. In the bowl of a stand mixer, combine sugar and milk and stir. When the yeast starts to bubble, add it and let it sit for about ten minutes to activate.
Add melted butter, eggs, salt, mashed potato, and pineapple juice when the yeast has activated. Once the egg yolks are cracked and the potato starts to combine with the liquids, mix on medium speed with the dough hook.
While the mixer is running, add the flour gradually. Mix the flour in until a very sticky dough forms, after adding all of the flour.
After the dough has doubled in size, approximately an hour, cover the mixer with plastic wrap and let it rise.
Grease a 9x13 baking dish and dust a clean tabletop or cutting board with flour. Scoop the dough out of the mixing bowl onto your floured surface and sprinkle some dough around the rising dough's edge after the first rise. After adding a bit more flour to the surface, cut the dough into 2.2–2.5 ounce portions with a dough cutter. As an alternative, you might divide the dough in half and then divide each half of the dough piece again until you have fifteen or sixteen dough balls.
Roll each ball of dough into a ball or form the dough into a ball shape by pulling the edges under and under. Because the dough is quite sticky, you will frequently need to flour your hands. Place dough balls onto a baking sheet that has been oiled.
Put a fresh kitchen towel on top and let it rise for an additional thirty to forty minutes. Preheat oven to 350 degrees Fahrenheit.
The dough balls should be placed in the oven and baked for 20 to 25 minutes, checking at the 20-minute mark to make sure the rolls are golden brown on top.
Have fun!