SEN TONKIN Restaurant & Cafe is a Vietnamese restaurant and cafe by Seoho Lake in Hanoi. It serves course meals and a semi-buffet with unlimited salads, soups, bread, and desserts, along with almond shrimp fritters. Guests arrive with reservations. The restaurant is quiet at 6:15 p.m. but quickly fills with tour-bus groups, and it becomes noisy when large groups arrive.