The Polish striker scored an 18-minute hat-trick at the Westfalenstadion as Jurgen Klopp's side usurped Bayern Munich at the top of the Bundesliga.
"To score three goals and win 6-1 is fantastic," the 25-year-old, who now has nine goals for the season, told the league's official website.
"I didn't score enough in October so it's nice to score more now.
"Next we've got Arsenal and we're playing at home and want to win. We want to win as many games as possible."
Arsenal, Dortmund and Napoli are all on six points after three games in Group F, while Marseille sit bottom without a single point.