Prepare the Peaches: Boil water in a medium pot over high heat, cut a small cross on the bottom of each peach, and cook for 1 minute.

Stop the Cooking Process: Transfer peaches to cold water to halt cooking, peel, slice in half, and remove the pits.

Make the Mochi Dough: In a bowl, combine glutinous rice flour and sugar, gradually add water while stirring until smooth.

Microwave the Mixture: Cover with a damp paper towel and microwave on high for 1 minute, stirring after each minute for a total of 3 minutes.

Cool the Mochi Dough: Let the dough cool for about 5-10 minutes until manageable to handle.

Shape the Mochi: Dust work surface with cornstarch, roll out the dough to about ⅙-inch thickness, and cut into four equal portions.

Fill the Mochi: Place a peach half in the center of each dough piece and fold the edges over, pinching seams to seal.

Final Touches: Dust with more cornstarch and place seam-side down on the surface.

Serve and Delight: Enjoy chilled alongside matcha tea.