Soak the glutinous rice with water overnight (or at least 1 hour if you’re in a hurry).
In the meantime, soak pickled sakura leaves for 15-30 minutes to remove the salt.
Roll red bean paste into 6 small balls and set aside.
Drain the rice, and add water and food coloring. Mix well.
Transfer the mixture to a microwave-safe bowl. Cover with plastic wrap and microwave for 6 minutes. (Mix once after 3 minutes).
Remove the plastic wrap and add sugar. Mix well.
(Optional) If you prefer the extra sticky texture, you can pound the rice until it’s partly broken and very sticky.
Divide the rice into 6 equal portions.
Place a piece of plastic wrap on the working surface, and add 1 portion of the rice on top. Spread it out into a round thin layer.
Place a red bean paste ball in the center of the sticky rice.
Roll the rice over to cover the red bean paste completely.
Tighten the plastic wrap and make it into an oval shape.
Remove the plastic wrap and cover the mochi ball with a sakura leaf. Then repeat for the rest.