For the tomato salad:
1) Place greens in a bowl and toss with the vinegar and oil and season with salt and pepper. Transfer to a platter.
2) Arrange tomatoes over greens, sprinkle with salt, and drizzle with chive dressing. Sprinkle blue cheese over top and garnish with a few fresh chives.
For the creamy chive dressing:
1) Combine all ingredients in a blender and blend until smooth.