Peel the grapefruit so that the white skin is completely removed. Remove the fillets with a sharp knife between the parting skins. Squeeze the juice out of the parting skins, mix with lime juice and honey.
Emulsify oil in a thin stream. Season to taste with salt and pepper. Roughly chop the nuts. Wash coriander, shake dry and pluck off leaves. Clean and wash the fennel, grate dry and slice into thin slices.
Cut avocados in half lengthwise, open, remove seeds and peel. Cut the flesh into slices.
Arrange avocado, fennel, grapefruit and nuts on a plate. Spread vinaigrette over it. Sprinkle with coriander.