Add rhubarb and sugar to a small pot, and fill pot with just enough water to cover the rhubarb. Bring to a boil, then lower heat to medium. Cover, and simmer until the rhubarb stalks begin to fall apart.
Strain sugar-water off of the rhubarb into a container, reserving rhubarb for another recipe if desired. Allow rhubarb syrup to cool to room temperature. (If desired, put syrup in the fridge to speed cooling process.)
Rhubarb Pink Gin:
Swirl the dash of bitters in a cocktail glass until the inside of the glass is completely coated.
Stir gin and rhubarb simple syrup with ice until chilled. Strain gin mixture into the cocktail glass, garnish with strawberry if desired, and serve.
Notes
*Faster Cook Time: The Rhubarb Simple Syrup can be made ahead of time to shorten the recipe time to 1 minute.