  We consider quantum quenches from an ideal Bose condensate to the
Lieb-Liniger model with arbitrary attractive interaction strength. We focus on
the properties of the non-equilibrium steady state reached at late times after
the quench. Using recently developed methods based on integrability, we obtain
an exact description of the stationary state for a large number of bosons. A
distinctive feature of this state is the presence of a hierarchy of
multi-particle bound states. We determine the dependence of their densities on
interaction strength and obtain an exact expression for the stationary value of
the local pair correlation $g_2$. We discuss ramifications of our results for
cold atom experiments.
