Continuing his Food Trail of the Basque Country, Neven explores San Sebastian. The city is unique in having a university dedicated to food, and Neven drops by to meet the director Joxe Mari Aizega. He also calls in at Arzak, a Michelin-starred restaurant with a "lab" in which new dishes are created and learns how to make one of the restaurant's most famous chocolate desserts. Neven's recipes this week include: Flourless orange and almond cake with rosemary syrup, and Saddle of rabbit stuffed with black pudding.