Mix the oranges in a mixer for approx 3 minutes.
Pour sugar and the citron juice in a casserole and heat it up until the sugar melt.
Take away the casserole from the stow and pour the orange mixture in the casserole and stir.
Let the mixture cool down.
If you have a ice cream machine, pour the mixture in the machine and put it to sorbet program. Pour the sorbet in a box and put the box in the freezer for a few hours.
If you do not have an ice cream machine, pour the sorbet in a box and put it in the freezer for a few hours.