Plot: Ainsley Harriott prepares dishes for special occasions, including chorizo-crusted hake on boulangere potatoes with salad, orange mocha mousse with cardamom, and chicken cordon bleu with cannellini mash and cherry tomatoes. He is joined in the kitchen by chef Sabrina Ghayour, who whips up marinated steak and pul biber butter, and food writer Alex Hollywood, who demonstrates her twist on pineapple and cinnamon tarte tatin