Line a tray with parchment paper and dust with powdered sugar + cornstarch mix.
In a pan, heat sugar, water, and lemon juice until it reaches a thick syrup (soft-ball stage).
In another pan, cook cornstarch mixed with water on low heat until it becomes a thick, smooth gel.
Slowly combine the sugar syrup into the cornstarch mixture while stirring continuously.
Cook on low heat for 45-60 minutes until thick, elastic, and pulling away from the pan.
Add rose water and optional food coloring. Mix well.
Pour into tray, smooth surface, and let set for 6-8 hours or overnight.
Cut into cubes and coat with powdered sugar & cornstarch mixture.