This can be used to moisten any cake that would benefit from a little lemon flavor, but I use it specifically with the coconut cake I posted earlier.
1/2 cup water
1/3 cup sugar
1/2 cup freshly squeezed lemon juice
Combine water and sugar in a small saucepan and bring to a boil over medium-high heat. Stir frequently and cook until sugar is dissolved and the liquide is syrupy, 10-12 minutes. Remove from heat and add lemon juice. Set aside to cool.