In a saucepan over medium heat, soften the vegetables with the cumin in the oil. Season with salt and pepper. Add the broth, tomatoes, lentils, bay leaves and thyme. Bring to a boil, reduce the heat and simmer until the vegetables and lentils are tender, about 20 minutes. Remove the bay leaves and thyme sprigs. In a blender, purée until smooth. Add more broth if necessary. Add the parsley. Adjust the seasoning.