Rhubarb adds a tartness to this take on a Bourbon Sour with a honey-sweetened simply syrup. If you are sensitive to gluten-grain-based bourbon, Hudson Baby Bourbon is a100% corn based and could be a good alternative.
Add honey, water, and rhubarb to a small saucepan. Bring to a simmer, then turn heat to low for 10 minutes, stirring occasionally. Once honey has dissolved and rhubarb has started break down, remove from heat and allow to cool.
Once cool, strain into an airtight container and store in the refrigerator.
For the Rhubarb Bourbon Sour:
Add all ingredients to a shaker filled with ice. Shake.