Method:
Put lettuce, spinach, sliced onions and apples into a large salad bowl and toss together; set aside. Remove peel and pith from oranges. Working over a bowl to catch the juices, carefully cut between the membranes to remove the oranges in sections. Reserve juice in bowl and transfer orange sections to bowl with lettuce and spinach. To the bowl with the reserved orange juice add finely chopped onions, vinegar, mustard and honey and whisk together. While continuing to whisk constantly, add oil in a steady stream until blended. Add dressing to bowl with lettuce mixture and toss gently to coat. Garnish with sesame seeds and serve immediately, with pita bread on the side.