In a kettle cover lentils with water and add seasonings. Bring the water to a boil over medium heat, skimming the froth as it rises, and simmer, covered, for about 40 minutes.
Meanwhile, in a large skillet, crumble and brown sausage meat over medium-high heat. Transfer to the kettle with a slotted spoon and drain excess fat. Prick Italian sausages with a fork and brown in the same skillet over medium-high heat. Transfer to a cutting board and cut into 1/4-inch sections. Add to kettle.
Add remaining ingredients to kettle. Bring soup to a boil over medium heat and simmer for 1 hour.