We introduce a novel approach to investigate CP violation in the neutrino sector, based on the simultaneous detection of $ u_e$ and $bar{ u}_e$ stemming from the oscillation of $ u_{mu}$ and $bar{ u}_{mu}$ produced in the decay at rest of $pi$s and $mu$s at a beam dump. This approach relies on a novel liquid scintillator detector technology expected to yield unprecedented identification of $ u_e$ and $bar{ u}_e$ charged-current interactions, which we investigate by means of Montecarlo simulations. Here we report preliminary results concerning both the detection technique and its physics reach.