With warm wood banquettes and bright yellow walls, C. K. Shanghai could easily pass for a continental bistro. But it’s chef C. K. Sau’s spicy Chinese cuisine that entices diners to this Wellesley hot spot. As at Sau's previous location, New Shanghai in Chinatown, the usuals—crispy sesame chicken and sweet-and-sour pork—impress. But we adore the specialty items here: a crispy sweet-and-sour sea bass, meaty scallops stir-fried with pungent black pepper sauce, and shredded beef served with greaseless scallion pancakes. The best news: Whatever you choose, the food arrives fast, hot, and delicious.