Abbacchio, or milk-fed lamb, has been a Roman springtime delicacy since ancient times. In this version, the lamb is slowly braised with prosciutto, then thickened with a mixture of lemon and egg yolks just before serving. Both the lamb and the eggs are symbols of the crucifixion and Christ's resurrection, so it is no surprise that this dish is traditionally prepared for Easter, but it is also often prepared for less festive opportunities - it is too delicious to enjoy it only on a single day of the year.