Heung-Min Son gave Tottenham the lead in the 12th minute but the home team delightedly stayed there. Joshua Kimmich acknowledged three minutes later and just before halftime Robert Lewandowski completed the turn with his 55th Champions League goal.
Then Gnabry started his show. Two goals within two minutes and in the 83rd minute he set his third for the evening. But it didn't end there.
After Lewandowski made his second for the evening, Gnabry made his fourth for the evening until 7-2.
Last year's finalist from last spring went on a heavy loss while Munich sailed at the top of the group.