How to Make It
In a food processor, combine the mango, shallot, jerk sauce, lime juice and honey. Process until smooth and transfer to a medium bowl. Add the tuna and turn to coat. Cover and refrigerate for 3 hours.
Preheat the grill or broiler. Remove the tuna from the marinade, season with salt and pepper and grill on a lightly oiled rack or broiler pan for 1 to 1 1/2 minutes per side, for very rare, or slightly longer for medium. Serve with the Mango Couscous.