Heat the pineapple juice in a small saucepan over medium-high heat until warm, around 100℉ to 110℉. Remove from the heat and pour the warmed juice into a large mixing bowl of an electric stand mixer fitted with a paddle attachment.
1 ½ cups pineapple juice
Add the yeast and let it proof for about 5 minutes until foamy (even if using instant yeast - it will help the roll dough rise better and faster in this recipe by activating it first).
4 ½ teaspoons instant or active dry yeast
Add the sugar, honey, butter, eggs, vanilla, 2 cups of the flour, milk powder, and salt. Beat well until smooth.
½ cup (100g) granulated sugar, ¼ cup honey, ½ cup salted butter, 2 large eggs, 1 teaspoon pure vanilla extract, 2.2 cups (776g) bread flour, 1 ½ teaspoon salt, 2 Tablespoons milk powder
Switch to the dough hook attachment. Add the remaining flour, kneading until the dough starts to come together in a ball and begins to clear the sides of the bowl. Only add the additional flour if needed to reach a workable dough that is slightly sticky but clears the sides of the bowl. You may need more than 6 cups if using all-purpose flour instead of bread flour. Continue to knead with the dough hook for 5-7 minutes until the dough is soft and smooth. Cover the bowl with plastic wrap or a clean damp cloth and let the dough rise in a warm spot until doubled in size (about an hour).
3.3 cups (776g) bread flour
Spray a 9x13-inch pan with baking spray. Punch down the dough and turn it out onto a lightly greased surface.
Divide the dough into 24 evenly sized pieces and roll into balls. They should each be around 1 1/2 to 2 ounces if you want to weigh them on a kitchen scale for accuracy. Arrange the balls of dough into rows in the prepared pan.
Cover the rolls with plastic wrap and let rise another 1 to 1 1/2 hours until puffy and sides are touching.
Preheat the oven to 350℉ (177℃) while the rolls are rising. Remove the plastic wrap and bake, uncovered, for 20-25 minutes until golden brown. Remove from the oven and brush additional melted butter over the tops of the rolls while still hot. Let cool completely before slicing to use as sliders.