Slow cooked carrot and lentil soup

I popped this on first thing this morning to use up some carrots on the turn and it was a lovely winter warmer to come back to at lunchtime after spending 2 hours at the park with an icy wind.

I chopped up 3 carrots, added a large handful of well-rinsed lentils, a stock cube and some boiling water and cooked on high for 4 hours before blending.