1. Sauté leeks in oil in a medium skillet over medium heat, stirring occasionally, until the leeks are soft (about 5 minutes).
2. Add apples and continue cooking, stirring frequently, until apples begin to soften (about 3 minutes).
3. Remove from heat. Add honey, vinegar, salt and pepper. Stir gently to combine all ingredients. Serve warm.
4. Refrigerate leftovers within 2 hours.