Lemon Myrtle is an Australian Super Food and is becoming more popular as a lemon flavour as you do not need to use much to succeed to create a spicy lemon flavour.
I like the Dakkah recipe from Pale Princess which has a good balance of nuts, spices and seeds.
This recipe call for ground powder which you can make easilty with Lemon Myrtle Tea using a grinder or mortat and pestle - you only need a tea spoon of the dried leaf and the flavour will be fresh.