Heat pineapple juice to 110º F in a microwave safe bowl or on the stovetop. Add yeast and 2 Tablespoons of brown sugar, mix to combine. Let rest for 5-10 minutes until it is nice and foamy.
1 1/2 cups pineapple juice, 4 1/2 teaspoons active dry yeast, 2/3 cup light brown sugar
Add the pineapple juice mixture to an electric mixer, fitted with a paddle attachment. Add the remaining brown sugar, butter, vanilla, eggs, egg yolk, and salt. Turn the mixer on low.
1/2 cup butter, 1 teaspoon vanilla extract, 2 whole eggs, 1 egg yolk, 2 teaspoons salt
Add 1 cup of flour at a time until the dough is soft, but comes together and clears the side of the bowl. It will be sticky, but not super tacky. You may be tempted to add more flour, but if it comes away from the side of the bowl while mixing stop.
5-6 cups bread flour
Swap out the paddle attachment for the dough hook and knead for 3-4 minutes until a soft ball of dough forms.
Place the dough in an oiled bowl, cover and let it rise for 1 - 1 1/2 hours, until it has doubled in size.
Spray a 9x13 baking pan with non-stick spray. Gently turn the dough onto a clean surface. Use a sharp knife or bench scraper to divide the dough into 16-24 equal pieces (see notes below for sizes). Shape each piece into a ball and place in the prepared pan.
Cover the pan with a clean towel and let it rise for another 1 - 1 1/2 hours until the rolls have doubled in size.
Meanwhile, preheat the oven to 350º F.
Once the rolls have rise, place in the hot oven and bake for about 25 minutes until golden brown and fluffy.
Remove from the oven and immediately top with butter.
Butter for topping
Notes
Roll Sizes16 pieces = hamburger bun size (bake closer to 30-35 minutes) 20 pieces = dinner roll size (bake as directed) 24 pieces = store bought Hawaiian roll size (bake 20-25 minutes)