Brendan Rodgers was transported back to his first spell in charge of Celtic as his side struck six first-half goals against Dundee.
Celtic have lost top spot in the cinch Premiership since the winter break, drawing twice and winning narrowly in their other three league games.
But they rediscovered their groove with their biggest victory of the season as they thrashed Tony Docherty’s side 7-1 at Celtic Park.
There were seven different scorers for Rodgers’ side as Cameron Carter-Vickers, Adam Idah, Matt O’Riley, Daizen Maeda, Greg Taylor and Callum McGregor struck before half-time substitute Daniel Kelly curled home his first goal for the club.
Rodgers said: “It was a top performance. We had players coming back, connecting the game, speed in the game, creativity and a real ruthless mentality.
“I have said about the pitch a few times but a big congratulations to the staff who have been working hard over the past few weeks to get it to a level that allows us to play at that speed. And you can see the difference it makes.
“So I thought all round, from the stands to the pitch, it was a great night for us.”
Rodgers, whose side remain two points behind Rangers, added: “It felt more like when I was here the first time – that ruthless mentality of the team, simplicity of the game and the football we played. And that’s why we are here, to entertain the supporters.”
Rodgers had called for positivity in the stands before the game and the noise at the half-time whistle was more akin to a Champions League night, helped by the fact that Kilmarnock were beating Rangers before a second-half fightback from the leaders.
Rodgers said: “There was a really nice moment at half-time when they were coming in. The fans could see then how the level of performance had jumped up. We had everything we wanted from the game – the runs, the movement, the ambition.”
Dundee’s second-half performance offered some comfort for Docherty, whose side got a consolation through substitute Michael Mellon despite having Finlay Robertson sent off.
But Docherty was still reeling from their first-half collapse during the post-match media conference.
“It’s something I have not seen in the group so I am actually a bit shocked to see the level of goal we have conceded,” he said.
“We need to take ownership and responsibility for that, for not defending crosses, not defending our box properly, getting done by cutbacks, getting done on the insides.
“I have to say I thought Celtic were outstanding but we can do more and we need to take responsibility for that.
“But I have to defend those players, they have been brilliant for me this season and there has to be a wee bit of reality in terms of us being a newly-promoted team. I am not taking away the accountability from myself and the players and I would like to apologise to the support.
“But I will always back that group of players because I don’t think we have been lower than seventh in the league.”