Combine the butter, salt, maple syrup and sugar in a pot, and place on a medium-low heat, stirring occasionally, until well combined and sugar granules have dissolved. Remove from heat.
In a separate pot or bowl, mix the baking soda and boiling water and let it bubble, then add to the butter and sugar mixture.
Mix the dry ingredients together, and then add this to the wet mix.
Roll the cookie dough into long cookie 'sausages' and wrap in baking paper.
Chill in the fridge for a minimum of 20 minutes. This is important, as it helps hold the cookies together!
Slice the cookie sausages into approximately 16 pieces and place on a greased tray with plenty of space in between.
Bake at 175°c for 10 minutes, then remove from the oven, flatten each cookie with a spatula and then return to the oven for 2-3 minutes.