Grease and line a brownie tin (approx 20cm x 20cm square)
Cream the butter and sugar together for about 3-4 minutes until light and creamy
Add the eggs and beat well.
Add the buttermilk, lemon juice and lemon curd and combine - the batter may well curdle, but don't worry this will sort itself out once the flour is added
Beat in the flour util the mixture is smooth and thick
Pour into your prepared cake tin
Bake in the oven for 30-35 minutes until cooked right through
Leave to cool for about ½ an hour until you turn it out
Once it is completely cold, you can add your icing (made by mixing the icing sugar with the lemon juice)
Recipe by Mummy Mishaps at http://www.mummymishaps.co.uk/2018/05/lemon-and-buttermilk-traybake.html