In a stand mixer combine the flour, salt, and yeast. Add the water, honey, sour cream, and pineapple juice and blend. Once the dough starts to come together add the vanilla and eggs. Mix until the dough pulls away from the sides. It might not [pull away from the bottom of the bowl.
Transfer to a mixing bowl and cover with cling film. Set aside to rise until doubled in size or about 90 minutes. If your kitchen is cooler this might take a bit longer.
Once the dough has risen place additional flour in a shallow bowl. This will be used for dusting the rolls and your fingers. Divide the dough into 15 portions. The dough will be sticky and this is ok. Dust the portions with the flour and form into a ball. Place the balled dough into the baking dish and cover with cling film and allow to rise again until doubled in size about 90 minutes.
Preheat the oven to 350°F or gas mark 4. Brush the rolls with the melted butter and bake for 30 minutes or until the rolls turn golden brown. Allow to cool and brush again with any remaining butter.