03Pour lemon juice over; mix well to coat to prevent from turning brown and let marinate for about 1 hour or longer.
04Before using apples, drain any excess lemon juice.
05Prepare spinach and Romaine lettuce; dry on paper towels, and add to a large bowl.
06Add ice cubes and let chill for at least 1/2 hour to crisp.
07DRESSING - In a glass jar with lid, add orange juice, balsamic vinegar, olive oil, honey, poppy seeds, Dijon mustard, salt, and pepper; shake well to blend.
08TO SERVE - Remove ice from the greens and discard; drain any water.
09Add apples and pine nuts and toss to mix well.
10Add dressing mixture and toss to coat well.
11Arrange spinach on individual salad plates and top with 3 or 4 Mandarin orange segments.
12This dressing is also very good with young, mixed greens.