Singaporeans can bask in McDonaldâ??s Prosperity Burger, curly Fries and peach soda Thursday when its annual Chinese language New Yr promotion returns islandwide. The black pepper Prosperity Burger (S$5.70, single patty), comes with beef or hen and prices one other S$2 for a further patty. The Tornado Fries (S$3.90) can be found ala carte or …