Easy Key Lime Pie
Vibrant yellow filling meets a crisp, spiced crust in this classic citrus tart, balancing sharp acidity with rich sweetness. Achieving the ideal texture in a citrus custard relies entirely on protein denaturation rather than gelatin or prolonged stovetop cooking. Acidic citrus juice interacts directly with the dairy proteins in sweetened condensed milk, causing them to coagulate and thicken the mixture before it ever enters the oven. Whisking the egg yolks thoroughly with the condensed milk prior to introducing the lime juice prevents premature curdling and ensures a uniform emulsion.
Proper refrigeration transforms a loose citrus mixture into a firm, sliceable wedge. Acid-driven coagulation continues slightly during the initial chilling phase, improving density.