Solid oak table - nothing fancy, but has served us well for many years.
Made up of separate blocks glued together.

It is located pretty closed to a window, and due to that and the
constant use over the years has now lost its shine. I am no expert on
the matter, but I believe that it was treated with some sort of oil when
we bought it - definitely not varnish.

Planning to give it a gentle sanding first, but What should I use to
treat it with please? Needs to be safe for food obviously.

TIA.