I found this recipe while looking up winter fruit, but the dressing is my own.
Roll the kumquats between your fingers to release the natural oils. Cut in half. Peel and section a pink grapefruit. Cut sections in half. Cut avocado into cubes. Tear lettuce and watercress into bite sized pieces and mix the whole lot together. Make a prepared mustard with ground seeds, ACV and water, let it sit for a few minutes. Mix the dressing ingredients and toss with the salad. Serve on a bed of green leaf lettuce.