Heat a medium sized pot on medium high. When the pan is hot, add the oil. When the oil gets hot, add the carrot slices, onion slices and cumin.
Sweat the carrots until they start to soften on the edges.
Add the carrot juice or chicken stock and simmer uncovered for about 20 minutes or until the liquid in the pot reduces by a third.
We used a hand-blender to puree the carrots which worked out well but you could also transfer the ingredients to a blender or food processor and process until smooth.