2 6-ounce cans of white tuna in water, drained and flaked ⅓ cup mayonnaise 1 tablespoon lemon juice freshly squeezed 1 stalk celery finely chopped 1 green onion finely chopped 3 tablespoons fresh parsley chopped ¼ teaspoon salt ¼ teaspoon black pepper 8 slices bread ¼ cup butter softened 8 slices white cheddar cheese 1…