It was a bolt out of the blue from the Polish striker after 15 minutes at Stevenage Borough - receiving the ball with his back to goal, spinning his man and letting fly into the top corner from fully 30 yards.
Grzegorz had already hit the crossbar and his moment of magic paved the way for a convincing win against a youthful Chelsea outfit - three points secured when the big man headed home Sean Davis' free-kick in the second half.
It completed the league double over Chelsea having beaten them 2-0 at Aldershot in August and made it four wins on the trot for Clive's squad.
Coach Clive reflected: "I don't think anyone could have expected it but the strike was so clean that the keeper didn't have time to react until the ball had hit the back of the net.
It was international class and that gave us the opportunity to control the game
"I've been delighted with how Grzegorz has performed in the last couple of weeks. He scored his first goal against Portsmouth and followed that up with this brace against Chelsea. That will boost his confidence and you know he's in good form if required for the first team squad."
Clive was pleased with how the lads acquitted themselves against a Chelsea side offering little in attack but a tough nut to crack defensively.
"It was a tactical game and I thought the lads adapted very well to the opposition and how they played," added Clive.
"We started the game well when Grzegorz crashed a header against the crossbar but it was a case of being patient. We needed to play with quality to open them up and I was delighted with some of the crossing positions we got into.
"At 1-0 you are never totally sure but we kept pushing forward for a second, deserved to get that second and could have added to it. Overall, we deserved the scoreline and victory."
Clive Allen described Grzegorz Rasiak's stunning opening goal in the reserves' 2-0 win against Chelsea last night as 'something special'.