Place the carrot and orange juice in a medium glass microwaveable bowl. Cover or wrap tightly in plastic wrap.
Microwave on high for about 5 minutes. If the carrot is fork-tender, it is ready. If it is not fork-tender, continue to microwave in 30-second bursts until it is.
Blend (in blender or food processer) the carrot and the orange juice until smooth or, alternatively, mash with a potato masher until lump free.