Cut a small slice off each end of the orange and stand it upright on a cutting surface. With a knife, remove the peel from the grapefruit in strips, maintaining the curved shape. Holding the orange in one hand, cut out the segments of fruit between the membranes (this is called supreming).

Very gently toss together all of the ingredients except the avocado. Season the mixture to your taste and then fold in the avocado. Place a small handful of spring greens onto each plate and top with Winter Citrus Salad.