  Data on $\Lambda\Lambda$ hypernuclei provide a unique method to learn details
about the strangeness S =- 2 sector of the baryon-baryon interaction. From the
free space Bonn-J\"ulich potentials, determined from data on baryon-baryon
scattering in the S = 0, -1 channels, we construct an interaction in the S =-2
sector to describe the experimentally known LL hypernuclei. After including
short-range (Jastrow) and RPA correlations, we find masses for these LL
hypernuclei in a reasonable agreement with data, taking into account
theoretical and experimental uncertainties. Thus, we provide a natural
extension, at low energies, of the Bonn-J\"ulich one-boson exchange potentials
to the S =-2 channel.
