Li Tinggui mo in particular were recognized for their quality. Emperors gave them as presents to their scholars. Cai Xiang created a collection of Lishi mo made by four generations of the Li family. Emperor Shenzong rewarded the polymath Su Song with Li Tinggui mo for his scholarly pursuits. Li Tinggui's ink remained the standard to which other inksticks were compared until the reign of Emperor Huizong. An important paper medium for the Southern Tang was Pure Heart Hall paper. During the Tang dynasty generations of Jiangnan craftsmen developed their skills and artistic talent in creating paper. These trends were used by their successors in the Southern Tang to create Pure Heart Hall paper. This distinctive paper became the official paper for royal proclamations. Only privileged officials were given any for use in creating government documents. Pure Heart Hall paper retained its importance throughout the Southern Tang, it was so prized that it was not sold in marketplaces. After the Song defeated the Southern Tang a multitude of imitation Pure Heart Hall papers appeared as the process for creating genuine articles had become lost. Song literati began to value Pure Heart Hall paper after a gathering of notable scholars that included Liu Ban (劉攽), Mei Yaochen, Ouyang Xiu, Su Shi, noted its quality in poetic works. Ouyang Xiu later gifted Mei Yaochen two scrolls of Pure Heart Hall paper for calligraphy. Song painters utilized the paper for their artwork. Li Gonglin in particular only used Pure Heart Hall paper for his compositions. Cuisine Among the culinary options available in the Southern Tang was a pastry called yunying chao (雲英麨). It was often given as a gift during celebrations. Yunying chao ''was made from ground melon and a medley of flower bulbs and corms: lilies (百合), lotus (蓮), arrowhead (慈姑), fox nuts (雞頭), taro (芋), and two kinds of water chestnuts, 荸薺 and 菱. The mixture was steamed, sweetened with honey and then sliced into pieces. The dish continued to be made during the Song Dynasty. Foreign relations The foreign policy maintained by Li Bian has been described as maintaining a "martial conservatism." He recruited disaffected officials exiled from the north who found his realm to have bountiful resources. This made some of the newcomers contemplate its ability to expand territorially. The perceived need for Li Bian to prove his legitimacy through military conquest likewise motivated many Southern Tang officials. Li