Citrus Salad with Poppy Seed Dressing

In a small bowl, place the peeled and sliced avocados and squeeze the lemon juice over them to prevent browning. On 4 plates, mound the arugula and divide the grapefruit and orange supremes among them. Top with avocado slices. Drizzle each plate with the dressing. Cutting an orange supreme: Slice off the top and bottom 1/2" of each orange, revealing the flesh. Cutting in sloping strips, use a sharp knife to remove the rest of the orange's skin. Now cut the individual wedges apart into the bowl, leaving behind all pith. You'€™re left with just beautiful pieces of orange flesh. Do the same for grapefruit.