Preparation Whisk sugar and cornstarch in small saucepan to blend. Add 3/4 cup water. Whisk over medium-high heat until mixture thickens and boils, about 2 minutes. Stir in lemon juice, lemon slices and grated lemon peel. Cool. (Can be prepared 1 day ahead. Cover and chill. Bring to room temperature before serving.)
Preparation Whisk sugar and cornstarch in small saucepan to blend. Add 3/4 cup water. Whisk over medium-high heat until mixture thickens and boils, about 2 minutes. Stir in lemon juice, lemon slices and grated lemon peel. Cool. (Can be prepared 1 day ahead. Cover and chill. Bring to room temperature before serving.)