Rigelian chocolate was a confection from the Rigel system.
Rigelian chocolates were Kira Nerys' favorite confection. In 2375, Odo bought a small box of Rigelian chocolates as a present for Colonel Kira. Suddenly realizing he had not bought anything for his wife, Miles O'Brien offered to buy them from Odo, but he refused. (DS9: "Chimera")