Meat and wine on Shabbos:
Although there is no obligation to specifically eat meat and drink wine on Shabbos, nevertheless since in general most people have greater pleasure in consuming meat and wine over other foods and beverages therefore, they are to increase in eating meat and drinking wine in accordance with their affordability.
 Admur 242:2; See Rama Y.D. 341:1 and Shach Y.D. 341:7