Step 1
Combine 1 1/4 cup warm water and 2 teaspoons yeast in a large bowl; stir until yeast is dissolved. Stir in 2 1/2 teaspoons sugar. Let stand until yeast forms a creamy foam about 10 minutes.
Step 2
Sift 1 cup all-purpose flour 1 cup bread flour and 1 teaspoon salt together in a separate bowl. Stir into the yeast mixture. Add remaining all-purpose and bread flour 1/2 cup at a time until dough pulls away from the side of the bowl.
Step 3
Place dough on a lightly floured surface; knead until smooth about 8 minutes. Transfer to a greased bowl. Cover with plastic wrap and let rise until doubled about 1 hour.
Step 4
Punch dough down and cut into 9 equal pieces. Press down on each piece with your palm and roll against the work surface to form into a ball.
Step 5
Place balls of dough on a baking sheet lined with parchment paper. Cover with greased plastic wrap; let rise until puffy 40 to 50 minutes.
Step 6
Preheat oven to 375 degrees F (190 degrees C).
Step 7
Combine rice flour 1 cup warm water vegetable oil 2 tablespoons sugar 2 tablespoons yeast and 1/4 teaspoon salt in a bowl to make topping. Let rest for 5 minutes.
Step 8
Spread topping thickly over tops and sides of the rolls.
Step 9
Bake in the preheated oven until golden brown 25 to 30 minutes. Cool on a wire rack.