(I use frozen Strawberries just to help keep the slushie consistency, fresh Strawberries should also work though).
Fill your cocktail glass half way with ice, then pour the ice into your blender.
Add in the Rum, Lime Cordial, Simple Syrup and Strawberries. Then blend until smooth and a light slushie consistency.
(If it's not the consistency you'd like and you want it to be more frozen, just throw in a few more ice cubes and blend again).
Now pour into the glass and you can top it off with a fresh Strawberry on the side.