Leandro Trossard, Charles De Ketelaere, Kevin De Bruyne, Dodi Lukebakio and Nicolas Raskin were all on target, but it was Jeremy Doku who stood out for the hosts.

Belgium started brightly and almost took the lead with just 42 seconds on the clock through Trossard, but his shot was tipped behind by Abdelmouhib Chamakh.

Chamakh was on hand again to repel De Bruyne's free-kick soon after, but the Tunisia goalkeeper could do nothing to stop Belgium from taking a 28th-minute lead, with Trossard tapping home from close range after good work from Doku on the left.

Rudi Garcia's side continued to probe as De Bruyne's strike stung the palms of Chamakh before Brandon Mechele saw his close-range shot cleared off the line by Omar Rekik.

But the Red Devils would get their second eight minutes after the restart when De Ketelaere rose high to meet Youri Tielemans's cross and head into the top-right corner.

Just as Tunisia threatened a comeback when Elias Achouri struck the woodwork, the visitors were reduced to 10 men after Ismael Gharbi received his second yellow card for a late challenge on Doku in the 62nd minute.

Striker Romelu Lukaku continued his comeback for Belgium with 25 minutes off the bench. Lukaku did not make a single start for Napoli in Serie A this season.

Belgium made its man advantage count three minutes later as De Bruyne picked out the bottom-left corner, before two goals in two minutes from Lukebakio and Raskin late on rubber-stamped the victory ahead of its opening Group G game against Egypt on 16 June (AEST).

Tunisia is in Group F with Sweden, Japan and Netherlands.