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 Portobello Mushroom Tuna Melt?

You need 11 ingredients. The key ingredients include: 4 portobella mushrooms, stemmed, gills removed, 2 tbsp olive oil, 5 oz can tuna packed in water, drained, 1 celery stalk, finely chopped, and more.

Is Portobello Mushroom Tuna Melt suitable as seafood?

Yes, Portobello Mushroom Tuna Melt falls under the Seafood category and is a great choice for this type of meal.

How do I store leftover Portobello Mushroom Tuna Melt?

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

Portobello Mushroom Tuna Melt Recipe

Name: Portobello Mushroom Tuna Melt
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 4 portobella mushrooms, stemmed, gills removed; 2 tbsp olive oil; 5 oz can tuna packed in water, drained; 1 celery stalk, finely chopped; 1/2 cup finely chopped fresh flat-leaf parsley; 2 tbsp fresh lemon juice; 4 deli-thin slices Swiss cheese; 4 slice tomatoes; 1/2 cup mixed baby greens; 1/2 tsp salt; 1/4 tsp pepper

Try this homemade Portobello Mushroom Tuna Melt recipe the whole family will love. Made with portobella mushrooms, olive oil, tuna and celery stalk. Eas…

This Portobello Mushroom Tuna Melt relies on simple, everyday ingredients such as olive oil, celery stalk, finely chopped, fresh lemon juice and tomatoes. It comes together quickly and makes 4 servings, at about 554 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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Portobello Mushroom Tuna Melt

Tips for the best results

Variations & substitutions

My Personal Notes

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