Rhubarb Mojito

Made this a while back. Pretty sure I made modifications but can't remember anymore. :(

Ingredients

For the Rhubarb Syrup:
3 pounds rhubarb, sliced thin	1/2 cup granulated sugar
1 cup light brown sugar	1 1/2 cups water
For each Rhubarb Mojito:
4 tablespoons rhubarb syrup	5-6 large mint leaves, torn
1 ounce white rum	Seltzer or club soda
Ice	Lime for garnish

Directions
For the Rhubarb Syrup:

In a medium, heavy pot, combine the rhubarb, light brown sugar, granulated sugar, and water. Bring to a brief boil, then turn down the heat to medium-low and simmer until the rhubarb is soft.
Strain the fruit (actually, I think it’s a vegetable) and set aside for another use. You should be left with a runny, not-yet-syrupy liquid.
Clean the pot and add the strained liquid. Boil over medium high heat until reduced to a thick syrup. Cool completely.

For the Rhubarb Mojito:.

Add rhubarb syrup and mint to each glass (I used a small highball-type glass). Add 1 ounce of white rum. Stir to mix.
Top with seltzer or club soda, add ice, and top with a wedge of lime for garnish.
Drink.

Source: http://www.brooklynfarmhouse.com/2009/04/17/rhubarb-mojito/