Heat oil in a heavy bottomed saucepan and saute onions, celery and green pepper over high heat until light brown, about 10 minutes.
Stir in garlic, all herbs, salt and peppers, tomatoes and hot pepper sauce. Blend well and simmer 15-20 minutes, until thick. Cool and store covered and refrigerated.
Grill onions and peppers until browned and set aside.
Sprinkle turkey breast on both sides with Cajun seasoning and press on firmly.
Per sandwich order: Heat a very light coating of vegetable oil in a heavy saute pan over high heat until smoking. Add turkey slice and cook about 1-1/2 minutes per side until blackened. When almost done, place Mozzarella on top to melt.
Spread Creole sauce on bottom half of roll. Place hot turkey slice with cheese on bottom of roll and cover with onions, green peppers, and top half of roll. Place a toothpick in both sides of sandwich and cut in half on the diagonal. Serve immediately.