Gently wash and core the tomatoes. Use a pairing knife to cut a circle around the top of the tomato, not too close to the edge though and then use a spoon to scoop out the middles-- creating an edible bowl.
4 medium
In a mixing bowl, stir together the tuna, mayonnaise, mustard and seasonings.
14 oz canned albacore tuna, 1/4 cup mayonnaise, 1 tbsp Dijon mustard, 1/2 tsp garlic powder, 1/2 tsp onion powder, 1 green onion, salt & pepper, dash celery salt
Carefully scoop the tuna salad into the hollowed tomatoes. Transfer the stuffed tomatoes to an oven-safe dish.
Lightly drizzle the tomatoes with olive oil, and top each with a slice of the Havarti cheese.
olive oil, 4 semi-thick slices spiced Havarti cheese
Bake at 425 degrees for 15 minutes.
Let rest for 1-2 minutes before serving.