Lentil Soup with cayenne

1 (12 ounce) bag lentils , sorted and rinsed 2 lbs diced ham 4 stalks celery , thinly sliced 4 carrots , diced 1 medium onion , diced 8 -10 button mushrooms ,[...]

sea salt , more to taste 1 1/2 tablespoons olive oil 1 large onion , chopped 2 cups chopped leeks , white and light green only 1 medium sweet potato , diced,[...]