# What You’ll Need:
→ Tuna Salad
01 - 2 cans (5 oz each) tuna in water, drained
02 - 1/4 cup mayonnaise
03 - 1 tablespoon Dijon mustard
04 - 1 celery stalk, finely chopped
05 - 2 tablespoons red onion, finely chopped
06 - 1 tablespoon fresh parsley, chopped
07 - 1 teaspoon lemon juice
08 - Salt and black pepper, to taste
→ Sandwich Assembly
09 - 4 slices hearty bread (sourdough or whole wheat)
10 - 4 slices tomato
11 - 1 cup (about 4 oz) shredded cheddar cheese (or Swiss, Gruyère)
12 - 2 tablespoons unsalted butter, softened
# Step-by-Step:
01 - Preheat your oven broiler or set a toaster oven to broil setting.
02 - In a medium bowl, combine tuna, mayonnaise, Dijon mustard, celery, red onion, parsley, lemon juice, salt, and black pepper. Mix until thoroughly incorporated.
03 - Arrange bread slices on a baking sheet. Spread softened butter lightly on one side of each slice. Place buttered side up under broiler for 1–2 minutes until golden.
04 - Flip bread slices so toasted side faces down. Spread tuna salad evenly over each slice. Top with tomato slice, then generously sprinkle with shredded cheese.
05 - Return baking sheet to broiler for 3–5 minutes, watching closely, until cheese melts completely and edges turn golden brown.
06 - Remove from oven and allow to cool briefly before serving warm.