I remember doing this vinaigrette for a party at work, and spooning it over grilled salmon. A salad would definitely taste great, especially if pieces of grapefruit are added also. Try it out! 

GRAPEFRUIT AND ROSEMARY VINAIGRETTE 

1/2 fresh and ripe grapefruit

1 stalk fresh rosemary, minced
1 shallot, sliced thinly
honey

White wine vinegar

Dijon mustard, about 1 teaspoon
Blended oil (canola oil )
Salt

In a bowl, add minced rosemary, sliced shallots, honey, white wine vinegar, dijon mustard, and juice from grapefruit. In slow thin streams, add blended oil, whisking until vinaigrette comes together. Taste and season with salt. Adjust to you liking, altering sweetness, grapefruit juice or acidity.