Cut beef and veal into 2-inch pieces. Combine flour and rustic rub in a small bowl. Working with 1 piece at a time, lightly coat meat with seasoned flour, then gently pound meat to 1/4 inch thick with flat side of a meat pounder, turning meat over occasionally.
Heat oil in a wide 5- to 6-quart heavy pot over moderately high heat until hot but not smoking, then sauté all meat, stirring constantly and turning over, until evenly and lightly browned on both sides, 5 to 6 minutes. Add onion, bell pepper, and celery and cook, stirring and scraping up any brown bits from bottom and side of pot, until softened, 5 to 6 minutes. Add tomatoes and garlic and cook, stirring frequently and scraping bottom and side of pot, 3 minutes. Add bay leaves, thyme, oregano, basil, salt, cayenne, black pepper, broth, and wine, then reduce heat and simmer, partially covered, stirring occasionally, until meat is very tender, about 1 1/2 hours.
Discard bay leaves and stir scallions and parsley into grillades. Serve immediately.