Add rice, lentils, yeast, lemon juice, miso, rosemary and 1/2 cup of broth. Cook until the liquid is absorbed, stirring occasionally so the lentils and rice do not stick to the bottom of the pot. Continue adding 1/2 cup of broth at a time(while stirring to prevent sticking), letting the risotto absorb most of the liquid before adding more. Total cooking time will be about 35 minutes, or until rice and lentils have softened.