In a bowl, combine the mayonnaise and pesto. Set aside.
In another bowl, combine the broccoli, tomato, tuna and 60 ml (1/4 cup) of cheese. Season with salt and pepper.
With the rack in the highest position, preheat the oven’s broiler.
On a baking sheet, lay the slices of bread. Toast under the broiler. Turn the slices over and generously cover with the pesto mayonnaise. Add the broccoli mixture and sprinkle with the remaining cheese. Continue broiling until the cheese is lightly golden brown.
Recipes with the "Healthy Pick" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.