I made a lemon cake and made some lemon curd and lemon buttercream for it.
What you need for this tutorial two cake layers, flavours of your choice.
Here are some cake flavour suggestions
Then you will also need filling for your cakes
For the lemon and coconut cake I recommend some homemade lemon curd and some lemon buttercream. You can make Swiss meringue buttercream and flavour it lemon with lemon zest or lemon flavour