Creamy lime and coconut biscuits

Sick and tired of dry and crumbly biscuits? I have a solution; fancy biscuits. These ones are crispy, thin, brandy-snap like little biscuits filled with a lime butter cream...oh did I forget to say that they are perfect to keep in the freezer and eat just a tiny bit defrosted?! Basically they are just delicious.
I have made them since I was a kid, and when looking around for something to snack on it felt like gold wort finding these biscuits in the freezer.

Biscuits
35 grams butter
50 grams sugar
50 grams dessicated coconut
1tbsp flour
1/2tbsp milk

Melt butter and sugar in a pot on low heat. Add coconut, flour and milk and let simmer for 2 min while stirring. Put teaspoons of the mix on to a baking tray. This has to be done in batches because the mix will melt and float out a lot. Bake on 180C for 6-8min, or until golden. Let cool down before filling.

Butter cream
45 grams icing sugar
50 grams butter, room temperature
1 egg yolk
1 lime

Beat butter and sugar until thick and pale. Add the egg yolk and continue beating the mix until smooth. Add the zest of the lime and juice to taste. Spread the butter cream between two bicuits and keep in fridge or freezer.