  Dihadron Fragmentation Functions (DFF) provide a vast amount of information
on the intricate details of the parton hadronization process. Moreover, they
provide a unique access to the "clean" extraction of nucleon transversity
parton distribution functions in semi inclusive deep inelastic two hadron
production process with a transversely polarised target. The NJL-jet model has
been extended for calculations of light and strange quark unpolarised DFFs to
pions, kaons and several vector mesons. This is accomplished by using the
probabilistic interpretation of the DFFs, and employing the NJL-jet
hadronization model in the Monte Carlo simulations that includes the transverse
momentum of the produced hadrons. The strong decays of the vector mesons and
the subsequent modification of the pseudoscalar meson DFFs are also considered.
The resulting pseudoscalar meson DFFs are strongly influenced by the decays of
the relevant vector mesons. This is because of the large combinatorial factors
involved in counting the number of the hadron pairs that include the decay
products. The evolution of the DFFs from the model scale to a typical
experimental scale has also been performed.
