Syrups & Cordials
Fill a large basin with water and place an immersion circulator inside. Set the circulator to 145°F. Put all the ingredients in a bowl and stir to combine. Transfer to a sealable, heatproof plastic bag. Seal the bag almost completely, then remove as much air as possible by dipping the bag (other than the unsealed portion) in the water. Finish sealing the bag, then remove it from the water. When the water has reached 145°F, place the bag in the basin and cook for 2 hours. Place the bag in an ice bath and let cool to room temperature. Pass the syrup through a fine-mesh sieve. If any particles remain in the syrup, strain it through a paper coffee filter or Superbag. Transfer to a storage container and refrigerate until ready to use, up to 2 weeks.