Blueberry Spinach Salad

½ cup vegetable oil
¼ cup raspberry vinegar
2 tsps Dijon mustard
½ tsp salt
1-10 oz. pkg fresh spinach
4 oz. blue cheese, crumbled
1 cup fresh blueberries
½ cup chopped pecans, toasted
1 cup mandarin oranges

Combine first 5 ingredients in jar. Cover with lid and shake well. In large bowl, toss remaining ingredients. Add dressing and toss gently; serve immediately. Yield: 6 – 8 servings