Liverpool's FA Cup triumph has been described as "unreal" by Trent Alexander-Arnold, who has now won every major club honour available to him so far in his career.
Alexander-Arnold scored his spot-kick as Liverpool went on to beat Chelsea 6-5 in the penalty shoot-out at Wembley on Saturday.
After a goalless draw over 120 minutes, Edouard Mendy saved Sadio Mane's penalty, but Alisson subsequently denied Mason Mount, setting the stage for Kostas Tsimikas to net the winning spot-kick.
The Reds won the EFL Cup against Chelsea in February in similar circumstances, triumphing 11-10 in a shoot-out on that occasion.
Alexander-Arnold is only 23, but has already won the FA Cup, EFL Cup, Champions League, FIFA Club World Cup and the Premier League.
He told the Reds' official website: "[It feels] unreal, to be honest. I was sat there thinking this is the only one I’ve got left now to complete the set and to do it is an amazing feeling.
"It's something that I've dreamed of and it's something that not many players can say they have done, so to be able to do it with this amazing club and this amazing team is a special feeling for me."
Liverpool, who face Real Madrid in the Champions League final on May 28, have won both of England's domestic cup competitions for the first time since 2000-01, when they also went on to win a European trophy that season.
The EFL Cup final between these teams also finished goalless, despite the array of attacking talent on show, while the two league fixtures both ended all square this season.
Alexander-Arnold added: "Honestly, it's always tight when we play Chelsea. We just can't get the better of each other, it always comes down to pens and draws.
"That's four draws now [this season], it's rare, so it's hard to beat them but we were resilient and we've got the job done when it matters. We've kept calm under pressure."
Tsimikas was the unlikely hero for Liverpool, with the back-up left-back keeping his cool from 12 yards after replacing Andrew Robertson.
"It just shows the depth that we've got, lads coming in," Alexander-Arnold said. "The way we did it in the EFL Cup and now.
"It's amazing, the changes we've made, the players coming on and doing their job unbelievably well. It's an amazing group and it's a special season."
Liverpool still harbour hopes of sealing an unprecedented quadruple, though they have only two games left to catch league leaders Manchester City, who are three points clear.