Bring lemon rind, lemon juice, sugar, and cornstarch to a boil in a saucepan over medium heat.
Stir constantly.
Reduce heat to simmer and cook 2 to 3 minutes or until sauce is thick.
Remove from heat and stir in 1 teaspoon orange juice.
Serve warm.
Refrigerate up to 1 week.
Notes
I specifically made this sauce for my Dunkin Donuts Bread Pudding recipe for a birthday brunch. I served that bread pudding warm with fresh strawberries and warm Easiest Lemon Sauce. It was gone in minutes.