Place the chocolate, condensed milk, lemon extract and lemon curd in a saucepan over medium heat. Stir until the chocolate is melted and the mixture is smooth.
Pour the fudge into a pan lined with baking paper and spread evenly.
Cover the pan with foil and refrigerate for at least 4-6 hours to set.
Once set, you can cut the lemon fudge into cubes. This fudge is a little softer than most chocolate fudge, so it is easiest to cut it straight from the refrigerator.
Because this fudge is a bit softer, I decided to wrap the cubes in pieces of baking paper. This makes them easier to store, but they are also really fun to wrap them as a gift this way.
How to store
Keep in the refrigerator in an airtight container for a week. In the freezer for up to 3 months.