3/4 c. salad oil (virgin olive oil)
3/4 c. sugar
1/2 c. vinegar (salad vinegar or wine vinegar)
2/3 c. chili sauce or catsup
1/2 tsp. salt
1/2 lemon (juiced fresh) or 1 1/2 tsp. reconstituted lemon juice
1 tbsp. paprika
1/2 tbsp. garlic powder
1/8 tbsp. onion powder

Run this in the blender for 3 to 5 minutes, chill.