Sprinkle each lobe and any loose pieces of the goose liver (foiegras) on both sides with kosher salt and white pepper. Sprinkle one third of Sauternes in terrine and firmly press large lobe of foie gras, smooth side down, into bottom. (Wedge any loose pieces of foie gras into terrine to make lobe fit snugly.) Sprinkle with another third of Sauternes. Put smaller lobe of foie gras, smooth side up, into terrine and firmly press down to create a flat surface and snug fit. Sprinkle with remaining Sauternes. Cover surface of foie gras with plastic wrap, then cover terrine with lid or foil.