Lyon made it two wins from two in Group E of the Champions League as an irresistible first-half showing saw them coast past Debrecen.
Three unanswered goals in the opening 24 minutes - with Kim Kallstrom and Miralem Pjanic netting before Peter Czvitkovics beat his own goalkeeper - were enough to seal the win.
Bafetimbi Gomis' second-half strike merely provided the icing on the cake.
Lyon started the scoring with what was their first meaningful attack of the ! night, Kallstrom steering home a left-footed shot with only two minutes on the clock.
Pjanic claimed the assist from the corner flag, finding the Swede on the outside of the box as the Ligue 1 side cut through the home defence with ease.
Jozsef Varga and Czvitkovics tried in vain to make something happen for Debrecen but both men failed to find team-mates with hopeful crosses.
Almeida Leandro fouled Francois Clerc after 10 minutes to give Lyon another opportunity.
Kallstrom tried his luck from the free-kick but he did not seriously test Vukasin Poleksic.
The home side continued to concede fouls as they attempted to establish themselves as the more physically imposing side and it was from a 12th-minute indiscretion by Varga that the second goal came.
Sidney Govou was the man fouled but it was Pjanic who took the free-kick, stroking home from 25 yards out.
Leandro gave visiting Hugo Lloris a rare save to make after 17 minutes.
Kallstrom continued to cause problems in the home defen! ce and i t was his wicked cross from the right which forced Poleksic into a hasty save at the near post.
Lyon could not be restrained for long though and with just 23 minutes gone the margin was 3-0.
Pjanic was heavily involved in the build-up, but this time it was Czvitkovics who had the final touch, beating his own goalkeeper from 12 yards as things went from bad to worse for Debrecen.
The home fans did see some improvement in the latter stages of the first period, Zsolt Laczko and Zoltan Kiss both looking lively in attack and Czvitkovics attempting to atone for his own goal with a 34th-minute shot that represented his team's best effort to date.
Govou and Clerc both had chances to make it four but Bafetimbi Gomis was the man who did, striking left-footed into the roof of the net in the 51st minute.
Lyon cooled their attacking exploits after that goal, apparently content, but Gergely Rudolf forced a smart save from Lloris five minutes later.
Govou was by some distance his side's most lively player in the closing stages, frequently making inroads in the home defence and unleashing a handful of shots, two of which pressed Poleksic into action.Rudolf and Kiss both had chances in the closing minutes to add a consolation, but Lloris was not unduly stretched.
