Keto Tuna Melt Stuffed Tomatoes

This is a fantastic low-carb, high-flavor meal that takes all the gooey, comforting goodness of a tuna melt and uses a juicy tomato as the “bread.”

It is naturally keto-friendly, gluten-free, and absolutely delicious. The tomato holds up beautifully in the oven, becoming tender and sweet, while the tuna salad on top gets bubbly and golden.

Here is the recipe for Keto Tuna Melt Stuffed Tomatoes.

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Why This Works

Traditional tuna melts use bread or an English muffin. By swapping the bread for a tomato, you eliminate the carbs while adding a burst of freshness and juiciness that pairs perfectly with the rich, cheesy tuna salad.

Ingredients

The “Bowl”:

• 4 large tomatoes (Roma or Beefsteak work best because they are sturdy and big enough to hold the filling)

The Filling:

• 1 can (12 oz) tuna, drained (solid white albacore or chunk light)

• ¼ cup mayonnaise (full-fat for keto)

• ¼ cup finely diced celery (adds a necessary crunch)

• 2 tbsp red onion, finely diced

• 1 tsp Dijon mustard (or yellow mustard)

• Salt and pepper to taste

• Optional: 1 tbsp fresh dill or pickle relish (for tang)

The Topping:

• ¾ cup shredded cheddar cheese (or Swiss, provolone, or a mix)

• 2 tbsp grated Parmesan cheese (optional, for extra crispiness)

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Instructions

Step 1: Prepare the Tomatoes

1. Preheat your oven to 375°F (190°C) .

2. Slice the tops off the tomatoes (about ¼ inch off the stem end).

3. Hollow them out: Use a small spoon or a melon baller to gently scoop out the seeds, pulp, and membranes. Be careful not to poke through the bottom or sides. You want a sturdy “cup.”

4. Salt and Invert: Sprinkle a little salt inside each tomato and place them upside down on a paper towel-lined plate for about 10 minutes. This draws out excess moisture, preventing the tomatoes from making the filling watery during baking.

Step 2: Make the Tuna Salad

1. While the tomatoes are draining, combine the drained tuna, mayonnaise, celery, red onion, mustard, and any optional add-ins in a medium bowl.

2. Mix well with a fork, breaking up the tuna. Taste and adjust salt and pepper as needed.

Step 3: Assemble

1. Pat the inside of the tomatoes dry with a paper towel.

2. Stuff each tomato generously with the tuna salad, mounding it slightly on top.

3. Place the stuffed tomatoes in a small baking dish (just large enough to hold them snugly so they don’t tip over).

4. Top with Cheese: Sprinkle the shredded cheddar (and Parmesan, if using) evenly over the top of each tomato.

Step 4: Bake

1. Bake uncovered for 15-20 minutes, or until the tuna is warmed through and the cheese is melted, bubbly, and starting to turn golden brown.

2. If you want a browner, crispier cheese top, you can turn on the broiler for the last 1-2 minutes. Watch them carefully so they don’t burn!

Step 5: Serve

Let them cool for 5 minutes before serving (the inside will be hot!). Use a spatula to transfer them to a plate.

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Tips for the Best Keto Tuna Melt Tomatoes

• Choose Firm Tomatoes: Squeeze them gently at the store. You want tomatoes that are ripe but still firm. Mushy tomatoes will collapse in the oven.

• Don’t Skip Draining: Removing the seeds and juice, then salting and draining the tomatoes, is the #1 secret to success. It prevents the final dish from becoming a soupy mess.

• Extra Veggies: Feel free to mix chopped spinach or bell peppers into the tuna salad for added nutrients and crunch.

• Make it Spicy: Add a few dashes of hot sauce or some red pepper flakes to the tuna mix.