Rhubarb Grilled Chicken

Combine first 4 ingredients in a saucepan and simmer until rhubarb is soft. Puree in a blender and set aside. Skin and lightly pound the chicken breasts. Oil the grill and cook chicken until just done, about 5 minutes per side. Brush chicken with rhubarb glaze during the final minutes of cooking, and serve with remaining glaze.