Tuna Melt Open-Faced Sandwich

Featured in: Pan & Oven Comfort

This satisfying sandwich combines flaky tuna mixed with mayonnaise, Dijon mustard, celery, and red onion for a classic creamy salad. Layered on sturdy bread with fresh tomato slices and generous shredded cheddar, then broiled until the cheese melts and creates a golden, bubbly crust. The contrast between the warm, crunchy bread and cool, savory filling makes this an ideal quick lunch or light dinner that feels comforting yet substantial.

Updated on Tue, 13 Jan 2026 12:24:00 GMT
Golden-brown open-faced Tuna Melt sandwich with bubbling cheddar cheese and a slice of tomato on toasted sourdough, served on a rustic plate. Pin it
Golden-brown open-faced Tuna Melt sandwich with bubbling cheddar cheese and a slice of tomato on toasted sourdough, served on a rustic plate. | taddutsignal.com

Rain was pounding against my kitchen window last Tuesday when I realized I had nothing for lunch but a pantry full of canned tuna. Something about gray weather makes me crave that particular kind of comfort food that's warm, cheesy, and fills the whole house with smells that say everything's going to be okay. I ended up making three tuna melts that afternoon, tweaking the recipe each time until the cheese was bubbling just right and the bread had that perfect crunch.

My roommate walked in mid afternoon, drawn by the smell of broiling cheese, and immediately asked for what I was making. We ended up eating them standing at the counter while the rain kept coming down, both of us agreeing that sometimes the simplest food is exactly what you need. That's when I knew this recipe was worth getting right.

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Ingredients

  • Tuna: Two cans drained well gives you the perfect ratio of fish to mayo without making the sandwich too heavy
  • Mayonnaise: Creates that creamy texture we all love from childhood deli sandwiches
  • Dijon mustard: Adds just enough sharpness to cut through the richness
  • Celery: Finely chopped brings essential crunch that keeps each bite interesting
  • Red onion: Gives a sweet bite that makes the tuna salad taste fresh
  • Fresh parsley: Optional but adds a bright herbal note that wakes everything up
  • Lemon juice: The secret ingredient that makes people ask what's different about your recipe
  • Hearty bread: Sourdough or whole wheat holds up better than soft white bread under all those toppings
  • Tomato: Adds moisture and a fresh element that balances the warm components
  • Shredded cheddar: Melts beautifully and creates those irresistible cheese pulls
  • Unsalted butter: Buttering the bread before toasting creates that golden restaurant style bottom

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Instructions

Get your oven ready:
Preheat your broiler and move the oven rack to the upper middle position so you can keep an eye on things
Mix the tuna salad:
Combine tuna, mayonnaise, mustard, celery, onion, parsley, and lemon juice in a bowl, seasoning until it tastes exactly how you like it
Toast the first side:
Spread a little butter on each bread slice and broil for just a minute or two until golden and fragrant
Build your melts:
Flip the bread, pile on the tuna salad, add tomato slices, and cover generously with shredded cheese
Melt everything together:
Broil for 3 to 5 minutes, watching closely as the cheese bubbles and edges turn perfectly brown
Let them rest briefly:
Give the sandwiches a couple minutes to cool so you don't burn your tongue on that first incredible bite
A comforting Tuna Melt recipe featuring creamy tuna salad with celery and red onion, topped with melted cheddar on buttery toasted bread. Pin it
A comforting Tuna Melt recipe featuring creamy tuna salad with celery and red onion, topped with melted cheddar on buttery toasted bread. | taddutsignal.com

Last month I made these for my sister who swears she hates tuna melts, and she asked for the recipe before leaving the table. Sometimes it's just about finding the right balance of creamy, crunchy, and melty that changes how someone thinks about a dish they've been avoiding for years.

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Making It Your Own

I've found that adding a pinch of smoked paprika or a few dashes of hot sauce to the tuna salad creates a whole different flavor profile. One friend swears by swapping half the mayonnaise for Greek yogurt, while another insists pepper jack cheese is the only way to go.

The Bread Choice Matters

Sourdough is my go to because the tang complements the rich tuna salad, but thick cut whole wheat adds a nutty sweetness that's just as good. Whatever you choose, make sure it's sturdy enough to hold everything together when you take that first bite.

Serving Suggestions

A simple green salad with vinaigrette cuts through the richness beautifully, and I've also served these alongside tomato soup for the ultimate comfort meal. The contrast of hot, cheesy sandwich and cool, crisp salad is honestly perfect.

  • Cucumber salad adds a refreshing element
  • Pickles on the side bring the acidity level up
  • Keep extra napkins nearby because things get messy
Close-up of a hot Tuna Melt with gooey melted cheese and juicy tomato slice, ready to eat for a quick lunch or dinner. Pin it
Close-up of a hot Tuna Melt with gooey melted cheese and juicy tomato slice, ready to eat for a quick lunch or dinner. | taddutsignal.com

There's something deeply satisfying about a well made tuna melt, the way the hot filling contrasts with the cool crunch of fresh toppings. Hope this recipe becomes your rainy day standby too.

Common Questions

What type of bread works best?

Hearty breads like sourdough or whole wheat hold up well under broiling. Sturdier slices prevent sogginess and provide a satisfying crunch that complements the creamy tuna filling.

Can I make this ahead of time?

Prepare the tuna salad up to 24 hours in advance and store it refrigerated. Assemble and broil the sandwiches just before serving for the best texture and warm, melted cheese.

What cheese varieties melt well?

Cheddar, Swiss, Gruyère, and mozzarella all melt beautifully. Pepper jack adds a spicy kick, while provolone offers a mild, creamy finish that complements the tuna.

How do I prevent soggy bread?

Lightly toasting the bread butter-side up before adding the filling creates a protective barrier. This initial toasting step ensures the bottom stays crisp even after broiling.

Can I use fresh tuna instead of canned?

Yes, grill or sear fresh tuna steaks, then flake into pieces. Season similarly and mix with the mayonnaise mixture. Fresh tuna provides a meatier texture and slightly lighter flavor.

What sides pair well with this?

A crisp green salad with vinaigrette, pickles, coleslaw, or tomato soup all complement the warm, rich flavors. For a lighter meal, serve with fresh vegetable sticks.

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Tuna Melt Open-Faced Sandwich

Creamy tuna salad topped with melted cheese on crispy bread, grilled until golden and bubbling.

Prep Time
10 min
Cook Time
8 min
Overall Time
18 min
Created by Cassandra Lee


Level Easy

Cuisine American

Serves 4 Portions

Diet Details None specified

What You 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

01 4 slices hearty bread (sourdough or whole wheat)
02 4 slices tomato
03 1 cup shredded cheddar cheese (approximately 4 oz)
04 2 tablespoons unsalted butter, softened

How To Make It

Step 01

Preheat Broiler: Turn on your oven broiler or set toaster oven to broil setting, allowing it to reach maximum temperature.

Step 02

Prepare Tuna Salad: Combine drained tuna, mayonnaise, Dijon mustard, chopped celery, red onion, parsley, lemon juice, salt, and black pepper in a medium bowl. Mix thoroughly until all ingredients are evenly distributed.

Step 03

Toast Bread: 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 brown, then remove from oven.

Step 04

Assemble Sandwiches: Flip each bread slice so toasted side faces down. Spread tuna salad mixture evenly over each slice. Place a tomato slice on top, then generously cover with shredded cheese.

Step 05

Melt and Serve: Return baking sheet to broiler and cook for 3-5 minutes, monitoring closely to prevent burning. Remove once cheese is completely melted, bubbly, and edges are golden brown. Allow to cool for 2-3 minutes before serving warm.

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Gear Needed

  • Mixing bowl
  • Spoon or spatula
  • Baking sheet
  • Oven or toaster oven with broiler function
  • Knife and cutting board

Allergy Warnings

Always check ingredients for allergens and ask a healthcare expert if you have concerns.
  • Fish (tuna)
  • Eggs (mayonnaise)
  • Dairy (cheese, butter)
  • Gluten (bread)

Nutrition Information (per portion)

Nutrition info is for guidance only and doesn't substitute advice from a professional.
  • Caloric Value: 370
  • Fats: 20 g
  • Carbohydrates: 26 g
  • Proteins: 22 g

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