Place cleaned spinach in your favorite salad bowl. Add:

4 slices crumbled bacon
1 (11 oz.) can mandarin oranges, well drained
1/2 lb. sliced mushrooms (optional)
1/4 to 1/2 c. slivered or whole almonds

In a separate container, mix:

6 tbsp. olive oil or salad oil
3 tbsp. cider vinegar
3 tbsp. crumbled blue cheese
1/4 tsp. salt
1/4 tsp. dry mustard
1/8 tsp. pepper

Pour over salad and toss.