The Italian striker came off the bench to score the decisive goal in Sunday's 2-1 success over their fierce rivals Newcastle his first strike for the north-east club.
That matches his Premier League tally for Liverpool, where he spent an injury-disrupted first season having arrived in a £10m deal from Roma.
The arrival and fine form of Daniel Sturridge in January pushed Borini further down the Anfield pecking order and although he was allowed to leave on loan for the season, the 22-year-old is clear about where he sees his future.
"There has been a squad revolution there but the worst thing for me was getting injured when I was actually playing at the start of last season.
"I remain a Liverpool player, I'm on loan because there wasn't space for me and after a year of injuries I needed to get my confidence back, to play some games. But my roots are still there."
His immediate focus is with Sunderland, though, and victory over Newcastle lifted them off the bottom of the table with a first win of the campaign.
"It was definitely important, not so much just for me but for the whole team," he said. "It came at a difficult time and to get out of that slump is very important. It feels fantastic."
Sunderland's new manager Gus Poyet made the brave decision to leave Borini's compatriot Emanuele Giaccherini on the bench at the Stadium of Light. Giaccherini arrived from Juventus in the summer with a big reputation but Poyet looked elsewhere for the Tyne-Wear derby lineup and Borini suspects there was a clear plan at work.
"I don't know why Giaccherini was benched and I don't know if he's spoken with the boss about it," he said. "We were all saying that it was an English lineup, and perhaps an English lineup might be more motivated for a derby."