Preheat the oven to 160℃/325 fan, 180℃/350F or Gas Mark 4 and grease your loaf tin and line it with baking paper.
Put all of the cake ingredients into a large bowl and beat until smooth.
Spoon into the prepared tin and smooth out. Bake for 1 hour 15 minutes or until a skewer comes out clean.
For the drizzle:
While the cake is still warm in the tin, use a skewer or thin sharp knife to poke holes all over it.
Mix the icing sugar with enough of the juice of the lemons to make a thin paste. Add the liquid gradually so it stays nice and smooth. (This is normally 1-and-a-half lemons, but will depend on how big and juicy they were!)
Pour all over the cake and allow to sink in.
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