Yam and Sweet Potato Sesame Patties

This recipe is adapted from New Thai Cuisine, by Nathan Hyam. An American who studied extensively in Thailand, he brought his expertise back to Vancouver, British Columbia, where he shares his love for Thai cuisine. He is particularly taken with Thailand’s wonderful street foods, such as these hard-to-resist sesame-crusted yam and sweet potato patties. For entertaining, form the patties and coat them with the sesame seeds up to 8 hours in advance. Fry them 30 minutes in advance and k