Add all ingredients to a saucepan and place on the stove over medium-high heat. Bring to a low simmer and stir occasionally to help the sugar fully dissolve. Cook for 4 to 5 minutes, or until the cranberries burst open and the liquid becomes a bright red color.

Remove from heat and allow to cool slightly. Prepare a mason jar with a sealing lid or other leak-proof storage container. Use a ladle and a fine mesh strainer to strain the simple syrup liquid.