Combine flour, 1/4 teaspoon pepper, and 1/4 teaspoon salt in a shallow dish.
Dredge veal in flour mixture.
Heat 1 teaspoon butter and 1 teaspoon oil in a large Dutch Oven over medium heat. Add half of veal; cook 6 minutes, browning on both sides.
Remove and place browned veal in a bowl.
Add onion...

Place bread in a food processor; pulse 2 times or until coarse crumbs measure 1/2 cup.
Combine breadcrumbs, beef, and next 5 ingredients (through egg) in a bowl.
Shape into 36 (1 1/4-inch) meatballs.
Heat a large nonstick skillet over medium-high heat.
Add one-third of meatballs; cook 1 minute, shaking pan to brown on all sides....