Combine salad greens, onions and desired amount of vinaigrette in a medium sized bowl. Arrange on serving platter and garnish with blue cheese and pecans. Serve immediately.
ORANGE VINAIGRETTE: Combine first 4 ingredients in medium-sized bowl. Gradually whisk in olive oil, then 1/2 cup water. Continue whisking until smoothly blended. Add additional 1/4 cup water if a thinner consistency is desired.