  Mesonic fluctuations off the chiral soliton of the Nambu--Jona-Lasinio model
are investigated. The hedgehog configuration is proven to represent a local
extremum of the action. The method is applied to flavor SU(3) and the energy
eigenvalue of the kaon bound state in the soliton background is evaluated which
is the key ingredient for the Callan-Klebanov approach to hyperons. The energy
eigenvalue of the corresponding strange-valence-quark is found to be 183MeV
higher than the energy eigenvalue of the up-valence-quark when 400MeV is
assumed for the up-quark constituent mass.
