Remove curd from heat and strain through a mesh strainer to remove any of the egg white that may have coagulated as well as the lime zest. Pour strained curd into a sterilized bottle. Place a piece of plastic wrap directly on the surface of the curd to prevent it from forming a skin on top. Cool at room temperature. Remove plastic wrap. Cover jar tightly and refrigerate for up to 1 week.
Yield: Apx. 1 cup
*caster sugar may also be known as fruit sugar, berry sugar, super fine sugar, or instant dissolving sugar. For best results and an exceptionally satiny-smooth textured curd, I recommend using this super-fine sugar in all curd recipes.
Note: Altitude may affect the temperature at which the water reaches the simmering point. The important thing is that the water in the bottom of the double boiler does not boil or touch the top of the double boiler/heatproof bowl during the cooking of the curd.