Broccoli and Oranges Salad

4 cups broccoli florets (1 12 lbs. fresh) 1 onion (purple, thinly sliced and separated into rings) 12 cup raisins 12 cup pecan (pieces toasted) optional 31 cup mayonnaise (miracle whip)

14 cup sugar 3  tbsps..or less white vinegar 11 ozs mandarin oranges (drained)  or use REAL oranges.