Spinach Apple Salad

2 tablespoons cider vinegar
2 tablespoons vegetable oil
¼ teaspoon salt
¼ teaspoon sugar
1 cup diced, unpeeled apples
¼ cup chopped sweet onion
¼ cup raisins
2 cups torn fresh spinach
2 cups torn romaine
1. In a small bowl, combine vinegar, oil, salt and sugar; mix well. Add apple, onion and raisins; toss lightly to coat. Cover and let stand for 10 minutes. Just before serving, combine spinach and romaine in a large salad bowl; add dressing and toss.