South Korea's hard-grafting Son scythed all the way from one box to the other before lashing into the net for a goal of the highest quality at the Tottenham Hotspur Stadium.
The ever-humble Son underscored exactly why he is such a manager's dream when insisting "I have to be positive" amid the dejection of that Old Trafford defeat.
Because when the chance arose to atone for that midweek misery in Manchester, Son made good on the vow to keep his head up – and then some.
Son's one-touch assist created the space for Kane's fine fifth-minute opener, it was his break and shot that led to Lucas' second; and that was even before the coup de grace.
Never mind Burnley's ineptitude, Son still had to stalk the bulk of this fulsome field, skinning defenders at will before angling home.
Spurs boss Mourinho had already declared his "love" for Son at the start of this week.
Kane thundered Tottenham into a near-immediate lead that the hosts never looked remotely like relinquishing.
The England talisman fired a trademark 25-yard opener, wrong-footing Burnley keeper Nick Pope with a minimal backlift strike into the left corner.
Son's neat first-touch lay-off gifted Kane the space and Burnley paid the price for standing off the arch-finisher.
South Korea star Son stepped through the Burnley traffic just four minutes later to help Spurs double their lead. The half's outstanding performer saw his shot rebuffed, but the quick-thinking Alli was able to hook the ball across the area – for Moura to bundle home.
Sissoko struck the post despite doing the all hard work to clip past Pope, after another cutting canter from Son.
And then Alli dallied too long in the area to let Tarkowski slide in and flick the ball off his toes for a goal-saving challenge.
Robbie Brady headed onto both crossbar and post in a rare Burnley raid, but Spurs were quickly back on the front foot.
Son's third and most destructive run on the ball saw him jink from one box all the way to the other – and then still boast the poise to slot home a fine finish.
Kane extended the one-way traffic after the break, checking in from the inside left before blasting into the roof of the net.
Sissoko made up for his first-half miss when prodding home after exchanging passes with Kane for Spurs' fifth.
This was another pleasing strike on an afternoon where Mourinho doubtless warmed even more to Son – and where perhaps the Spurs faithful warmed that bit more to their new boss too.