Dinner / Sandwiches, burgers & pizza
Classic Diner Tuna Melt with Sharp Cheddar
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Toast first, so the bread stays crisp under cool, creamy tuna with celery and capers. Sharp cheddar goes on top and under the broiler until it bubbles and freckles gold. Eat it hot, with both hands.
The short version
Toast the bread first. Mix tuna with mayo, Dijon, celery, red onion, capers and some cheddar, pile it on the toast, top with more cheese and broil 2 to 3 minutes until bubbling and spotty gold.
What makes ours better
why ours wins the argument at dinner
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Toast the bread before topping. Wet tuna salad on soft bread makes a soggy sandwich. Toasting first makes a crisp base that holds up.
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Put cheese in the tuna and on top. The mixed-in cheese melts throughout, so every bite is gooey. The top layer gives the golden crust.
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Add celery, capers and lemon. Crunch, salt and acid keep the tuna salad lively instead of heavy.
What you need
the stars of the show
- Tuna3 cans
- Mayonnaise3 tablespoons
- Dijon mustard1 tablespoon
- Finely diced celery⅓ cup
- Finely diced red onion3 tablespoons
- Shredded sharp cheddar1½ cups
- Slices sourdough or rye bread4 large
read it twice. buy it once.
Steps
apron on. phone down. mostly.
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Heat the broiler
Set a rack about 5 inches below the broiler and turn it on high. Line a rimmed baking sheet with foil.
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Toast the bread
Lay the bread on the baking sheet and broil 1 to 2 minutes until golden. Flip and toast the other side. Watch closely; broilers vary and bread goes from golden to burnt fast.
About 2 min. Cook mode has a timer for this step.
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Mix the tuna salad
Flake the drained tuna into a bowl. Stir in the mayonnaise, Dijon, celery, red onion, capers, lemon juice, pepper and ½ cup of the cheddar until just combined. It should hold together without being wet.
Drain the tuna hard, pressing out liquid with the lid. Extra liquid is the cause of soggy melts.
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Pile on the tuna
Spread a quarter of the tuna salad on each slice of toast, all the way to the edges, so no bare crust burns. Add a tomato slice or two if you like.
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Top with cheese
Sprinkle the remaining 1 cup cheddar evenly over the four sandwiches.
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Broil to melt
Broil 2 to 3 minutes until the cheese is bubbly and spotted gold. Watch the whole time.
About 3 min. Cook mode has a timer for this step.
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Rest and serve
Let them sit for 1 minute so the cheese settles. Serve with a pickle spear on the side.
Good to know
things I learned the hard way, so you can skip that part
- Oil-packed tuna is richer; water-packed is leaner. Drain either one well.
- Swap cheddar for Swiss, provolone or Monterey Jack. Aged cheeses melt better than pre-shredded, which has anti-caking starch.
- To make it a closed sandwich, add a second slice of toasted bread on top after broiling.
- The tuna salad keeps in the fridge for 2 days, so you can mix it ahead.
- Storage. Best eaten right away. Leftover tuna salad keeps 2 days in the fridge. Reheat a leftover melt in a toaster oven at 350°F for 5 minutes.
Questions, answered
asked and answered at the kitchen counter
How do you keep a tuna melt from getting soggy?
Toast the bread first, drain the tuna very well, and go easy on the mayo. Don't let a finished sandwich sit.
What cheese is best for a tuna melt?
Sharp cheddar is the classic. Swiss, Gruyère and provolone also melt well. Grate your own for the smoothest melt.
Can I make a tuna melt without a broiler?
Yes. Use a toaster oven or a 425°F oven for about 5 minutes. Or make it in a skillet, covered, with butter on the outside of the bread.
Can I make tuna melts in an air fryer?
Yes. Toast the bread first, then cook the topped sandwiches at 375°F for 3 to 4 minutes until the cheese melts.
What kind of tuna is best?
Solid light or albacore in olive oil or water both work. Flake it well so the salad holds together.
What goes with a tuna melt?
Tomato soup, a green salad or a pile of kettle chips and a pickle. Try it next to crispy grilled cheese sandwich if you want soup-and-sandwich night.
From the table
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Published October 29, 2026.