Step 1: Add all of your ingredients to a shaker and shake hard for 20 seconds. Strain through a fine strainer into a chilled coupette. Step 2: *To make butter infused Stinky Fish Challenge, gently melt 50g of butter until liquid, and in a jar combine with Stinky Fish Challenge, shake and leave for 2 hours. Then pop into the freezer so the butter separates and freezes. Filter the Stinky Fish Challenge through a coffee filter and bottle.