Syrups & Cordials
Fill a large basin with water and place an immersion circulator inside. Set the circulator to 130°F. Put all the ingredients in a bowl and stir until the sugar has dissolved. 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. The counterpressure from the water will push the rest of the air out. Finish sealing the bag, then remove it from the water. When the water has reached 130°F, place the bag in the basin and cook for 2 hours. Transfer the bag to an ice bath and let cool to room temperature. Pass the cordial through a fine-mesh sieve. If any particles remain in the cordial, strain it again through a paper coffee filter or Superbag. Transfer to a storage container and refrigerate until ready to use, up to 2 weeks.