Sour Salad Dressing

Ingredients:
- 1/2 c. Wish-Bone Italian dressing
- 2 Tbsp. ketchup
- 2 Tbsp. grated Parmesan cheese
- 1 level Tbsp. real mayonnaise

Directions:
- Blend on high speed for 10 seconds.
- Makes 2/3 cup; will keep long time.