In a small saucepan, stir all ingredients together and simmer for about 30-45 minutes, until ginger ale has reduced into a syrupy state and rhubarb has broken down. Add vinegar and stir.
Season with salt and peppers and adjust heat by adding more chili sauce or Aleppo Pepper. Refrigerate after using.
Notes
*Note: Aleppo Pepper can be found now in most spice shops, but if you can't find it, substitute with red pepper chili flakes. You can also find it online at Spice Station.