Soak your lentils for about half an hour.
Oil in a pot, chopped onions, other chopped veg, simmer for about half an hour.
Rinse lentils and add them, along with stock.
Season with salt and pepper and simmer for about 15 mins.
Blend. Check seasoning, and alter to taste. Add half a pot of single cream.
That's generally how I make all soups haha.