This is a different dressing for a salad with citrus in it.  You can substitute orange juice or pink grapefruit juice for the grapefruit.

Ingredients:

• 1/2 c  wine vinegar
• 1/2 c r grapefruit juice
• 1 tsp dried minced onion
• 1/2 tsp  Dijon mustard
• 1 tsp sugar
• 1/8 teaspoon salt
• 1/8 tsp  pepper
• 1 c olive oil

Directions:  

1. Combine first 7 ingredients in a medium sized mixing bowl.
2. Slowly whisk in olive oil to produce an emulsification.

Serves:  Makes about 2 cups

Source:  Genius Kitchen