Trim the aubergines (eggplant). Cut in half lengthways and scoop out some of the flesh, leaving a shell about 6mm/¼ inch thick. Make four incisions lengthways in each half, being careful not to cut through skin. Salt aubergine (eggplant) halves, making sure salt goes into incisions and leave for 20 minutes. Wash aubergines (eggplant), squeeze dry, and sauté in olive oil