Sour Lemon Sauce

This is a fantastic sauce - got the recipe from Martha Stewart -

• Ready In: 20 mins
• Yields: 3 1/2 cups

Ingredients

• 1 1⁄2 cups sugar
• 3  tablespoons cornstarch
• 1  pinch salt
• 2 1⁄2 cups warm water
• 7  tablespoons unsalted butter, cut into pieces
• 2  lemons, zest of
• 1⁄2 cup fresh lemon juice

Directions

1. Bring sugar, cornstarch, salt and warm water to a boil in a medium saucepan over high heat, whisking constantly. Cook, whisking constantly, until mixture thickens, about 5 minutes.
2. Stir in butter and lemon zest and juice. Cook, whisking until smooth, 2-3 minutes more. Remove from heat; transfer to a medium bowl to cool completely before putting into jars. Sauce can be refrigerated for up to 2 weeks.