My guest on Special Sauce both this week and next is chef-restaurateur Andy Ricker, whose Pok Pok restaurants in Portland, Oregon, and in Brooklyn introduced me to the joys of Northern Thai food.   We delve into his hippie roots growing up in rural Vermont, his varied professional background ranging from working in low- and high-end restaurants to playing in several bands to house painting, and how his extensive travels helped transform his perspective of cooking from a way to get by into a passion.   When it opened, Ricker didn't call Pok Pok a Thai restaurant for a variety of reasons. I'll leave you here with just one of them: He didn't want people saying, "You're a white dude. How dare you claim tradition and authenticity." For the rest of them, you're just going to have to listen to both this week's episode and next week's, as well, when Andy and I take a deeper dive into the issues of authenticity and cultural appropriation. Don't worry. It will be time well spent.