  We present high-resolution spectroscopic observations of the fast nova
ASASSN-16kt (V407 Lup). A close inspection of spectra obtained at early stages
has revealed the presence of low-ionization lines, and among the others we have
identified the presence of the ionised $^7$Be doublet in a region relatively
free from possible contaminants. After studying their intensities, we have
inferred that ASASSN-16kt has produced (5.9 - 7.7)$ \times 10^{-9}$ M$_{\odot}$
of $^7$Be. The identification of bright Ne lines may suggest that the nova
progenitor is a massive (1.2 M$_{\odot}$) oxygen-neon white dwarf. The high
outburst frequency of oxygen-neon novae implies that they likely produce an
amount of Be similar, if not larger, to that produced by carbon-oxygen novae,
then confirming that classical novae are among the main factories of lithium in
the Galaxy.
