These lemon curd bars are zesty, bright delicious and so easy to make. With just 5 ingredients, the lemon curd is encased in a crumbly, buttery shortbread. These lemon curd bars are delicious crumb bars (aka a simple bar with a crumble topping) of shortbread and lemon curd. They're ridiculously easy to make and taste extremely morish, and with just 5 ingredients how can you say no?! These lemon crumbs bars are perfect for picnics, bake sales and fetes, baby showers, bridal showers and snacks.