Carefully add the water (it may bubble aggressively). Stir until the hardened sugar dissolves again.
Let the syrup cool to room temperature before serving. Tips for Success RIT - HUMMM SABOROSO - 20 10 2020 - MANJAR BRANCO
Mix the cornstarch into the reserved cold milk until completely smooth to avoid lumps. Carefully add the water (it may bubble aggressively)