Is there such a thing as "sweet" carrots? These days I am trying to get my wife to eat her carrots. Usually we are just boiling them, and adding some spices and butter.

But she swears that she used to eat sweet carrots, but she can't say how long ago. Supposedly I should know the difference, but I don't recall such a thing. It must be that my sense of taste is weak.

In any case, is there a sweet variety of carrots? Or is there a common recipe to sweeten them up?
Carrots get sweeter if they are left in the garden till after the ground freezes (generally under mulch to facilitate winter digging.) 

Then again, I personally consider cooking carrots a good way to ruin them, as I find them far better raw.