Place the ground coffee and water in a jar and leave at room temperature for 8 hours. Strain the coffee using a fine sieve or a French press. Store in the fridge until you are ready to use.
Place all the ingredients in a saucepan over a medium heat. Cook, stirring occasionally, until well combined, about 5 minutes. Remove from the heat, allow to cool and then store in an airtight jar in the fridge.
Pour the cold brew into a large glass, stir in the cinnamon syrup. Add the crushed ice and then slowly pour in the dairy free milk.