Bring 2.5 litres of water to the boil in a large pot
chop up all the veg except 2 carrots into small cubes
grate the remaining 2 carrots
add veg and stock cubes to water
cut bacon into small chunks and add to pot
rinse lentils in cold water and add to pot
simmer slowly for 1hr, removing the scum as you go.
Add salt/pepper to taste.
For best results leave soup for at least 4hrs before serving for flavour to intensify.