You can buy El Torito's dressing in the store but I really don't think that it's as good as this recipe. Try it and let me know what you think!
1 Tbsp dry ranch dressing
1 Tbsp red wine vinegar
2 Tbsp Parmesan cheese
1/2 cup oil
1/2 cup buttermilk
2/3 to 3/4 cup chopped cilantro
Blend all the ingredients except the oil in a food processor for 30 seconds. Start adding the oil while still blending. Voila! That's how simple it is!