  We study the production of VHE emission in blazars as a superposition of a
steady component from a baryonic jet and a time- dependent contribution from an
inner e-e+ beam launched by the black hole. Both primary relativistic electrons
and protons are injected in the jet, and the particle distributions along it
are found by solving a one-dimensional transport equation that accounts for
convection and cooling. The short-timescale variability of the emission is
explained by local pair injections in turbulent regions of the inner beam. For
illustration, we apply the model to the case of PKS 2155-304, reproducing a
quiescent state of emission with inverse Compton and synchrotron radiation from
primary electrons, as well as proton-proton interactions in the jet. The latter
also yield an accompanying neutrino flux that could be observed with a new
generation km-scale detector in the northern hemisphere such as KM3NeT.
