Stir together 1/3 cup sugar, water, lemon juice and cornstarch in a small saucepan until cornstarch is completely dissolved. (cookandbemerry.com)
Step 12: If you want some blackberry sauce to go with the dessert then cook the remainder 1 cup of juice / puree, 1/2 cup sugar, and 1 T. cornstarch in a small saucepan and cook on medium stirring constantly until sauce thickens slightly. (you-made-that.com)
For meringue, whisk together sugar and cornstarch in a small saucepan. (site.jiffymix.com)