Grate 1/2 tablespoon zest from orange; reserve orange. Stir zest into salad dressing.
Use knife to remove skin and pith from orange. Use knife to cut between fruit and membrane to release each orange section. Squeeze membrane to extract 1/4 cup juice; reserve juice and orange sections.
In bowl, whisk reserved orange juice, mustard, and salad dressing. Remove 1/4 cup dressing to resealable food storage bag. Add veal cutlets to dressing in bag. Reseal bag and turn several times until veal is coated with dressing; set aside.
Prepare grill or heat grill pan over medium-high heat on stovetop. Remove veal cutlets from dressing; discard dressing. Grill veal cutlets 5-6 minutes, turning once. Remove cutlets from heat. Place on cutting board and cut into bite-size pieces.
Thinly slice fennel halves and place in bowl. Add red onion, farro, arugula, and radicchio; toss. Add veal, orange sections, reserved salad dressing, and hazelnuts.
Draw blade of vegetable peeler across surface of cheese to make thin ribbons. Toss to coat with dressing. Divide salad among four bowls.