Preheat the oven to 350°F (180°C). Line a 9-inch round cake pan with parchment paper or grease it with butter.
Whisk together the flour, baking powder and salt. Set aside.
Beat the sugar and butter until well combined. Add the eggs, one at a time, beating well after each addition. Add half of the lemon curd. Mix well.
Fold in the flour into the egg mixture until well-blended.
Spoon the mixture into the prepared pan. Drop by teaspoons-full the remaining lemon curd spreading it randomly over the top of the cake.
Bake for 35-40 minutes or until golden brown on top, though it may still jiggle a little. Leave the cake to cool in the pan. Turn out, remove the baking paper (if used), then dust with sifted confectioners' sugar, if desired.
Notes
TIPS & TRICKSThe cake shrinks as it cools down but it rises up while being baked. If using an 8-inch cake pan, place it above a baking sheet in case the cake bubbles over, or simply use a 9-inch pan.