  Junctions provide a wealth of information on the symmetry of the order
parameter of superconductors. We analyze junctions between a scanning tunneling
microscope (STM) tip and superconducting twisted bilayer graphene (TBG) and TBG
Josephson junctions (JJs). We compare superconducting phases that are even or
odd under valley exchange (s- or f-wave). The critical current in mixed (s- and
f-) JJs strongly depends on the angle between the junction and the lattice. In
STM-TBG junctions, due to Andreev reflection, f-wave leads to a prominent peak
in subgap conductance, as seen in experiments.
