|Lemon zest||2 Teaspoon, grated|
|Fresh lemon juice||2 Tablespoon|
In a small saucepan, combine sugar, lemon zest and cornstarch.
Gradually whisk in lemon juice and 1/2 cup water.
Bring to a boil, whisking constantly.
Simmer for about 30 seconds, or until slightly thickened.
Remove from heat and whisk in butter until melted.