安排9 x 13英寸烤盘或9 1/2杯rectangular plastic container in the freezer, making sure it’s level and secure. Put the sugar and 1 cup water into a medium saucepan. Cook, stirring, over medium heat until the sugar is dissolved, about 3 minutes. Set aside to cool completely or refrigerate for up to 1 day. For faster cooling, set the bowl over a bowl filled with ice and stir occasionally until well chilled.
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