Step 1

Drain the tuna and add to a large bowl along with the mayo, chopped avocado, chopped dill pickle and lemon juice.

Step 2

Mix everything together with a fork, mashing the avocado as you mix, until well combined. Taste and add salt and pepper as needed.

Step 3

Place oven rack in the top third of oven (2nd rack from the top). Preheat broiler to high.

Step 4

Slice the tomatoes into 6 thick slices. Place on a foil or parchment lined tray. If your broiler tends to get very hot use foil instead of parchment paper.

Step 5

Scoop tuna onto tomato slices and top with grated cheese.

Step 6

Broil for 2 to 3 minutes or until cheese is melted and bubbling. Remove from oven, top with fresh parsley and serve.