Broccoli Salad

Salad:
2 heads broccoli flowerets
1 small onion, chopped (optional)
10 slices bacon, crisp and crumbled
1 cup raisins

Dressing:
2/3 cup mayonnaise
1/2 cup sugar
1 1/2 Tb. vinegar

Combine and refrigerate salad ingredients. Mix dressing until sugar dissolves. Pour dressing on salad just before serving.