How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Open-Faced Tuna Melt Sandwich?

You need 12 ingredients. The key ingredients include: 2 (3 ounce) pouches white albacore tuna, drained, 3 tablespoons Primal KitchenTM Avocado Oil Mayonnaise, plus more for spreading, 2 teaspoons Dijon mustard, 2 tablespoons finely chopped red onion, or more to taste, and more.

Is Open-Faced Tuna Melt Sandwich suitable as seafood?

Yes, Open-Faced Tuna Melt Sandwich falls under the Seafood category and is a great choice for this type of meal.

How do I store leftover Open-Faced Tuna Melt Sandwich?

Store leftovers in an airtight container in the refrigerator for up to 3–4 days. Reheat gently before serving.

Open-Faced Tuna Melt Sandwich Recipe

Name: Open-Faced Tuna Melt Sandwich
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 2 (3 ounce) pouches white albacore tuna, drained; 3 tablespoons Primal KitchenTM Avocado Oil Mayonnaise, plus more for spreading; 2 teaspoons Dijon mustard; 2 tablespoons finely chopped red onion, or more to taste; 2 teaspoons capers, drained; 2 tablespoons chopped cornichons; 1 tablespoon lemon juice; 1/4 teaspoon fresh or dried thyme leaves; Sea salt and freshly ground black pepper to taste; 3 slices whole wheat or whole grain bread; 6 thin slices tomato; 3 large slices Gruyere, white Cheddar, or provolone cheese

Try this homemade Open-Faced Tuna Melt Sandwich recipe the whole family will love. Made with pouches white albacore, Avocado Oil Mayonnaise, mustard and…

This Open-Faced Tuna Melt Sandwich relies on simple, everyday ingredients such as dijon mustard, capers, drained, chopped cornichons and lemon juice. It comes together quickly and makes 4 servings, at about 476 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.

Updated Jun 30, 2026

Serves 4 Seafood

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Taste as you go and adjust the seasoning before serving.
Avoid overcrowding the pan — cook in batches if needed for the best texture.
Let the dish rest for a few minutes before serving so the flavors settle.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Feel free to swap in similar ingredients you already have on hand and adjust seasoning to taste.

No specific allergen information. Please check the ingredient list for possible allergens.

My Personal Notes

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Open-Faced Tuna Melt Sandwich

Tips for the best results

Variations & substitutions

My Personal Notes

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Frequently Asked Questions