In a large nonstick skillet set over moderate heat, warm the oil until hot. Add the onion and cook, stirring, 5 minutes. Add the mushrooms and salt and pepper and cook, stirring occasionally, for 5 minutes more. Add the sausage and cook, stirring, until no longer pink. Add the water, bouillon cubes, herbes de Provence, red pepper flakes, and lemon pepper, bring to a boil and simmer, stirring for 2 minutes. Add the couscous and simmer, stirring occasionally until tender. Before serving stir in the dill. Serve the couscous in bowls, drizzled with extra virgin olive oil and freshly grated Parmesan if desired.