The focus of northern Chinese cuisine is, of course, the Beijing school. Due to its imperial heritage of excess and affluence, Beijing cuisine came to be regarded as the most sophisticated yet robust style, using simple ingredients in an elaborate way. The elegance of Beijing cooking may not be apparent to the uninitiated; its simplicity masks clever techniques and a close understanding of the best produce of the region. Beijing cuisine is more influenced by the vast hinterland of Mongolia and beyond than it is by the sea on its eastern shores. Menus are thus rich in lamb, game and poultry, roasted or barbecued to tender perfection, as well as some fresh fish and shellfish from the ocean and rivers.