Clean the kale, wash thoroughly, drain well and cut into strips. Drain the artichokes and halve or quarter them. Peel grapefruits thickly so that the white skin is completely removed.
Cut out the fillets from the parting skins. Collect the juice. Cut turkey breast slices into wider strips, chop nuts roughly. Mix vinegar and grapefruit juice. Season with salt, pepper and sugar.
Add oil. Mix cabbage, artichokes, grapefruit, turkey and nuts with the vinaigrette and leave to stand for at least 30 minutes.