1. Place orange pieces in nonreactive mesh strainer set over bowl; let stand to drain excess juice. Meanwhile, whisk lime juice, mustard, coriander, salt, and pepper to taste in large bowl until combined. Whisking constantly, gradually add oil.

2. Add oranges, radishes, and arugula to bowl and toss gently to combine. Divide arugula among individual plates, place a portion of oranges and radishes over arugula, and drizzle with any dressing in bowl; serve immediately.

Serves 4