In a medium bowl, whisk together the powdered sugar and 3 tablespoons lemon juice until smooth.
Add the remaining lemon juice, 1 teaspoon at a time, until the icing reaches a consistency that can be drizzled over cakes, cookies, or quick breads.
Notes
You can add up to 1 teaspoon of vanilla extract or vanilla bean paste (for pretty vanilla bean flecks!) to this recipe for added flavor. A pinch of salt can also help to balance some of the tart and sweet flavors.
This makes enough glaze to ice a 10-inch bundt cake, two 9x5-inch loaf cakes or breads, a dozen muffins and scones, or 1-2 dozen cookies.