Alan Coxon, Kathy Sykes, Gennaro Contaldo

In Ever Wondered about .. ? Alan Coxon prepares pasta shells in a four-cheese sauce with a warm tomato salad, and Kathy Sykes explains why the secret of al dente pasta is in the flour used to make it. Also, Gregg Wallace is joined by chef Gennaro Contaldo , whose southern Italian menu features penne pasta with courgette flowers and fresh basil, stuffed fillets of swordfish served with blanched fennel and white onion, and a limoncello panncotta with a strawberry sauce.