The 18-year-old lined up in central midfield and was clearly the star turn of a richly entertaining game, which Spurs were hugely unfortunate to lose 2-1 after a stoppage time Derby winner.
Jonathan knitted the midfield together with incisive passing and intelligent movement - plus the odd party piece when the situation demanded and Colin certainly liked what he saw.
"He's bright and he's electric," said the reserve team boss. "He passes the ball very quickly and cleanly.
"Although there looks nothing of him, he gets in the way of an awful lot of people.
"We just had to get the ball to him as often and as early as possible."
Jonathan's ability and awareness seemed to bring out the best in those around him and Colin's side were a joy to watch at times against the Rams.
"He's infectious to others. He gives balls of the right weight and the right angle to people and then suddenly it becomes a lot easier to lay it off or receive it.
"That's the basis of a passing team - pace and angle of a pass is pretty important. When they did it simply and early and crisply they were alright."
Colin Calderwood was purring over the performance of Jonathan Blondel after the young Belgian made his first start for the reserves against Derby County on Wednesday.