Preheat the oven to 180°C.
Sift the flour into a mixing bowl, then add the salt and baking powder. Stir to combine.
Put the curd cheese into a mixing bowl and, using a fork, loosen it up. Add the melted butter, sugar, vanilla, lemon zest & juice and the egg. Combine well until you get a coarse mixture without any lumps.
Add the curd cheese mixture to the flour and stir until you get an even, slightly textured batter.
Fold in the raisins, if used.
Spoon the batter into 4 silicon bundt cake moulds and put these onto a baking sheet or wire rack.
Place the sheet/rack in an oven and bake for 25 minutes.
When they have cooled, you can glaze them with lemon icing or just dust them with icing sugar.