Craisin Spinach Salad

3/4 bag of spinach
1 bag of romaine lettuce
1 cup grated swiss cheese
2 cups craisins
1 cup cashews

Dressing:
3/4 cup sugar
1 tsp dry mustard
1 tsp salt
1/3 cup cider vinegar
1 cup oil
1/4 cup chopped red onion
1 1/2 T poppy seeds

This has been served at Thanksgiving dinner.