When Son Heung-min or Harry Kane score, the other is usually involved.
"We just understand each other really well," South Korea star Son told BT Sport afterwards, as his double helped Tottenham edge closer to qualification for the knockout stages.
Kane set up Son's equaliser after Frankfurt had taken an early lead, before the 29-year-old England captain scored from the penalty spot.
Son, 30, went on to score a thumping volley in the second half, and despite Kane missing another penalty in stoppage time, both were otherwise on top form at the Tottenham Hotspur Stadium.
"I know what [Kane] likes to do and he's the same.