After a poor start to the season, Steve Cooper's team got their first win of the season as they thrashed their local rivals at the bottom of the league.
James Maddison scored twice and created another for Patson Daka as Brendan Rodgers' side recorded their biggest home win of the year.
This was the first top flight derby since 1999 and for Forest it was a nightmare.
After Taiwo Awoniyi struck a post when clean through on the home goal, Cooper's side never recovered from the two conceded goals.
The Forest fans sang songs of defiance as they watched their team slip to a fifth straight defeat in a single season for the first time in four years.
After celebrating a long-awaited return to the premier league, owner Evangelos Marinakis didn't approve the outlay on 23 summer signings in a belief that Forest were about to go back down.
Cooper hopes his boss shows him more patience than Carlos Corberan, who was sacked after 11 games in Greece.
The evening was significant enough for the chairman to fly in from Thailand to watch the team that his family bankrolled to win the title, something he described as a difficult short term decision.
As the game started, he had the expression of a man who could be a couple of hours away from having to make a very big decision.
The man affectionately known as "Khun Top" was high-fiving supporters at half time, who were ecstatic at how the evening was going.
The efforts that followed were moments of unquestioned quality, with Daka's flick from Maddison's cross rounding off the scoring 17 minutes from
The joy at getting that win was obvious as Rodgers hugged his staff.
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