Spinach Salad

from Mom's Recipe Box

Salad:
1 bag spinach
1 head lettuce
1 c. grated swiss cheese
1 can mandarin oranges, drained
8 strips bacon, cooked and crumbled
1 med. red apple, diced
1 small bermuda onion, sliced
12 mushrooms, sliced

Dressing:
1 T. poppy seeds
1 c. canola oil
1/2 c. sugar
1 tsp. salt
1/2 tsp. dry mustard
1/2 c. red wine vinegar

Mix dressing and use part to marinate mushrooms for several hours. Toss salad ingredients together. Just before serving add just enough dressing to coat lettuce and toss thoroughly.