Bilad al-Sham Kitchen - Delicious tuna sandwiches

Ingredients:

8 pieces of toast

2 cans of tuna

1 chopped green onion

1 stalk of chopped celery

1 chopped pickled cucumber

1/4 cup of milk

1/2 cup mayonnaise

1 teaspoon Dijon mustard

1 teaspoon lemon juice

1 teaspoon of pickle water

1 tomato, sliced, optional, lettuce