Tuna in Mushroom Caps

Breakfast

October 25, 2026

Tuna in Mushroom Caps – paleo recipe

Cooking Time: 30 minutes Servings: 4 servings Ingredients: • 4 portobello mushroom caps • 3 cans yellowfin tuna in oil, drained • ½ tsp. garlic powder • ½ tsp freshly ground black pepper • 4 Tbsp. (60 ml) capers, rinsed • coconut oil to grease baking sheet • 1 medium avocado Directions: 1. Preheat oven to 450° F (230°C). 2. Mix tuna, garlic powder, black pepper and capers together in a bowl 3. Stuff the tuna mixture unto the portobello caps. 4. Arrange the portobello caps on a lightly greased baking tray and bake for 15-20 minutes. You can also wait for the caps to turn brown and become somewhat tender, as a sign that they are cooked. 5. Slice open the avocado, remove the seed. Slice the meat into thin slices and add them to the portobello caps as garnish. 6. You can change the avocado into raisins or dill for a different taste.

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Tuna in mushroom caps turns a few cans of tuna into an elegant, bread-free stuffed dinner. Yellowfin tuna, capers and garlic fill meaty portobello caps that roast in a hot oven until tender. Thin avocado slices finish each cap like a little crown.

Pro Tips

  • Drain the tuna thoroughly before mixing — wet filling steams the mushroom caps instead of roasting into them.
  • Mix the tuna with the garlic powder, black pepper and rinsed capers first so the seasoning is even before stuffing.
  • Bake at a hot 450 degrees for 15-20 minutes; the caps are ready when they brown and turn somewhat tender.
  • Slice the avocado thin and add it only as garnish after baking, so it stays cool and creamy against the hot mushroom.
  • For a different twist, swap the avocado garnish for raisins or fresh dill — both are lovely with the capers.

Frequently Asked Questions

Can I use tuna packed in water instead of oil?

Yes — just drain it well. Tuna in oil gives a richer filling that matches the meaty portobello, but water-packed works with the same method.

Can I stuff the caps ahead of time?

Absolutely — assemble them on the tray, refrigerate, and bake when ready. Add a couple of minutes to the bake if they go in cold.

How do I know when the mushrooms are done?

They'll brown around the edges and turn tender through the middle after 15-20 minutes at 450 degrees. Give one a gentle press — it should yield without being limp.

What should I serve alongside?

A crisp green salad with lemon vinaigrette keeps the plate light, or roasted vegetables for something more substantial.

Recipe Card

Tuna in Mushroom Caps – paleo recipe
Stav Kogan

Tuna in Mushroom Caps

Servings: 4 servings

Ingredients
  

  • 4 portobello mushroom caps
  • 3 cans yellowfin tuna in oil, drained
  • ½ tsp . garlic powder
  • ½ tsp freshly ground black pepper
  • 4 Tbsp . capers, rinsed
  • coconut oil to grease baking sheet
  • 1 medium avocado

Method
 

  1. 1.
  2. Preheat oven to 450° F.
  3. 2.
  4. Mix tuna, garlic powder, black pepper and capers together in a bowl
  5. 3.
  6. Stuff the tuna mixture unto the portobello caps.
  7. 4.
  8. Arrange the portobello caps on a lightly greased baking tray and bake for 15-20 minutes. You can also wait for the caps to turn brown and become somewhat tender, as a sign that they are cooked.
  9. 5.
  10. Slice open the avocado, remove the seed.
  11. Slice the meat into thin slices and add them to the portobello caps as garnish.
  12. 6. You can change the avocado into raisins or dill for a different taste.

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