A study of Mansour et al.2012 suggest the use of ginger in weight control. The authors demonstrated that 2g ginger powder (Zingiber officinale) dissolved in a hot water beverage enhances thermogenesis and reduces feelings of hunger in overweight men. 
Ginger had a significant effect of ginger on thermogenesis and reduced feelings of hunger, but did not alter total resting energy expenditure or respiratory quotient. Visual analog scales (VAS) ratings showed lower hunger, lower prospective food intake and greater fullness with ginger consumption, compared with the group which did not receive ginger. Ginger did not affect glucose, insulin, lipids, or inflammatory markers.
The authors suggest further studies of ginger in weight control.
 Mansour MS, Ni YM, Roberts AL, Kelleman M, Roychoudhury A, St-Onge MP: Ginger consumption enhances the thermic effect of food and promotes feelings of satiety without affecting metabolic and hormonal parameters in overweight men: A pilot study. Metabolism. 2012 Apr 24.