In a hot sauté pan, sear the andouille for 1 minute on each side. Remove the sausage from the pan. Stir in the flour and oil. Cook for 2 minutes for a brown roux. Add the onions, peppers, and garlic. Cook for 2-3 minutes or until the vegetables start to wilt. Add the andouille. Stir in the veal reduction and Creole mustard. Bring the liquid up to a boil and reduce to a simmer. Simmer for 15 minutes or until the vegetables are wilted and the sauce is like a gravy. Season with salt and pepper. Divide the smothered andouille between the two split loaves. Mound each sandwich with the slaw . Serve with Zaps and Omar Pies.