Chop lettuce. Arrange lettuce on platter and top with pieces of grapefruit and orange.
*To supreme fresh oranges and/or grapefruits instead, cut off ends then remove skin in strips working all the way around the fruit from top to bottom. Cut along the side of the membrane to remove the sections of the citrus fruit.
Combine marmalade with 2 splashes of vinegar and stream in extra-virgin olive oil. Pour dressing over the salad and season with salt and pepper. Garnish platter with chopped or snipped chives.