Is it possible to get a D in spring rolls? I also flunked tomato rose-making. ``No, no,'' said an exasperated Nguyen Thai Binh, executive chef, showing how the knife tip should slide under the outer peel as delicately as a heart surgeon's scalpel. Luckily, my Nuoc mam cham dipping fish sauce and Canh ca chua trung tomato soup turned out brilliantly, if I do say so myself.