Heat a small saucepan over high heat. Add butter and melt, swirling occasionally for 1-2 minutes until it foams and turns nut brown.
Use a spatula to fold the flour, shredded coconut, sugar, and 1/4 tsp of fine salt in a large mixing bowl until fully combined.
Remove the pan and let it cool slightly. Whisk in the honey, and vanilla until smooth.
Add the melted butter to the mixing bowl. Stir until the butter cools slightly, then add the egg.
Divide the dough into two halves and roll each into a 20cm log. Wrap each log in baking paper, twist the ends to seal, and tighten. Freeze for 30 minutes or until firm but still sliceable.
Preheat your oven to 160ºC (140ºC fan-forced) and grease two large baking trays, lining them with baking paper. Slice the dough into 1cm thick discs and arrange them on the trays (they won’t spread during baking).
Lightly scratch the top of each cookie with a fork. Bake for 25 minutes or until the biscuits are golden brown and crisp to the touch.
Whisk together the icing sugar, butter, milk, vanilla bean paste, and a large pinch of salt flakes until the frosting is light, fluffy, and smooth.
Let the biscuits cool on the trays for 5 minutes before transferring them to a cooling rack to cool completely.
Once the biscuits have cooled, spread 1 tsp of jam onto half of them and spread 1 heaped tsp of frosting on the remaining biscuits.
Sandwich the jam-covered biscuits with the frosting-covered ones, pressing firmly to seal.