In a mixing bowl, combine warm milk, pineapple juice, sugar, and yeast. Let it sit for 5 minutes until frothy.
Add melted butter, eggs, and salt to the yeast mixture. Mix well.
Gradually add flour, one cup at a time, mixing until a soft dough forms.
Knead the dough on a floured surface for about 10 minutes until smooth and elastic.
Place the dough in a greased bowl, cover, and let it rise in a warm place for about 1-2 hours or until doubled in size.
Preheat the oven to 350°F (175°C). Punch down the dough and divide it into 12 equal pieces. Shape each piece into a ball and place on a greased baking sheet.
Cover and let the buns rise for another 30 minutes.
Bake in the preheated oven for 20-25 minutes or until golden brown.
Remove from the oven and let cool on a wire rack.