Stuffed Onions with Tuna Recipe: Asturian Comfort Classic 2026

Stuffed onions with tuna is a traditional Asturian dish that turns humble onions into something truly special. Sweet onions are hollowed out, filled with a savory mixture of tuna, hard-boiled egg, tomato and roasted peppers, then slowly simmered in a rich tomato-wine sauce until meltingly tender.

This is a labor of love, but the result is absolutely worth it. The long, gentle cooking lets the onions soften and absorb all the flavors of the sauce, creating a comforting dish that's perfect as a starter or a light main course.

Serve these stuffed onions warm, with plenty of the sauce spooned over the top. They're ideal for a special dinner or a cozy family meal, and they taste even better the next day.

Ingredients for Stuffed Onions with Tuna

Serves 4

• 1 egg
• Salt
• 4 large onions
• 300 g canned tuna in olive oil
• 200 g tomato sauce (75 g for the filling and 125 g for the sauce)
• 175 g roasted red peppers (75 g for the filling and 100 g for the sauce)
• 55 g olive oil (20 g for the sofrito and 35 g for frying the onions)
• 1 garlic clove
• 150 ml white wine

How to Make Stuffed Onions with Tuna Step by Step

1. Boil the egg

First, boil 1 egg. Bring a small pot of water to a rolling boil over high heat, add a pinch of salt and the egg. Cook for about 12 minutes, then remove the egg and let it cool. Once cold, peel and finely chop it.

2. Hollow out the onions

While the egg cooks, hollow out 4 large onions. Peel each onion, then use a corer or a small teaspoon to remove the inside, being careful not to break the outer layers. Try to leave only the two outermost layers intact.

3. Chop the onion pulp

Once all 4 onions are hollowed, set aside a little of the removed pulp to use later for sealing the stuffed onions. Chop the rest of the pulp; you'll use it for the sauce sofrito. There's no need to chop it very finely since the sauce will be blended later.

4. Prepare the filling

To make the filling, put the chopped hard-boiled egg, 300 g canned tuna, 75 g tomato sauce and 75 g roasted red peppers cut into small squares in a bowl. Mix well with a fork.

5. Stuff the onions

Fill the onions using a small spoon, pressing the filling down so it's compact inside each onion.

6. Cover the onions

Cover the opening of each onion with the reserved onion pulp, pressing down gently so they are well sealed.

7. Sauté the garlic and onion for the sauce

Now prepare the sauce in which the stuffed onions will cook. Heat 20 g olive oil in a casserole over medium heat. When hot, add 1 chopped garlic clove and sauté for a few moments. Then add the chopped onion, a pinch of salt and cook for 5-6 minutes.

8. Add the roasted peppers

Next, add 100 g roasted red peppers cut into small squares, mix with the sofrito and cook for 2-3 minutes.

9. Add tomato sauce and white wine

Now add 125 g tomato sauce, mix and cook for 2 minutes. Then raise the heat and add 150 ml white wine. Mix and cook for 2 minutes until the alcohol evaporates completely.

10. Blend the sauce

At this point the sauce is ready. Blend it with an immersion blender and set aside.

11. Brown the stuffed onions

To cook the stuffed onions, use a casserole that fits them snugly so they stay put during cooking. Heat 35 g olive oil in the casserole over medium-high heat. When hot, place the stuffed onions inside, season with salt and let them fry lightly for a couple of minutes.

12. Add the sauce

Then pour the sauce into the casserole with the onions and reduce the heat to low.

13. Simmer and serve

Let the stuffed onions cook for 2 hours and 30 minutes with the lid on. After this time, serve them hot.

Tips for the Best Stuffed Onions with Tuna

Choose the right onions

Large, firm onions work best because they hold their shape after hollowing. Try to leave only the two outermost layers so the onions stay intact during the long cooking time.

Use a snug casserole

Pick a casserole that fits the stuffed onions tightly so they don't move around while cooking. This helps them keep their shape and prevents them from falling apart.

Be patient with the simmer

The long, slow cooking is what makes these onions so tender and flavorful. Keep the heat low and the lid on, and let the onions gently braise until they're meltingly soft.

30 Top Recipes I Keep Coming Back to at Home

Like a lot of home cooks, I like having a go-to lineup that covers cozy classics, dishes from around the world, and sweets that make everyone happy.

When a rich, indulgent craving hits, my picks are usually this La Viña Molten Cheesecake recipe, this elegant Original French Crème Brûlée recipe, or a decadent Chocolate Mousse Cake recipe. And whenever something fruity and comforting sounds good, this classic French Tarte Tatin recipe is the one I reach for.

Some mornings I want an easy breakfast or a lighter plate, so I'll whip up these fluffy Oatmeal and Banana Pancakes recipe, a satisfying Stuffed Sweet Potato recipe, or these fresh Eggs Stuffed with Avocado and Salmon recipe. And for a gluten-free staple to keep in the pantry, this simple Gluten-Free Rice Flour recipe is one I rely on.

For tapas nights and Mediterranean flavors, I bounce between this bold Basque Tuna with Tomato recipe, crispy Patatas Bravas Air Fryer recipe, creamy Tirokafteri Greek Dip Sauce recipe, and refreshing Burrata Salad with Tomato and Pesto recipe. This crisp Italian Vitello Tonnato recipe also comes out whenever I want to serve something a bit more special.

For filling lunches and cozy dinners, my recommendations are this comforting Meatballs in Spanish Sauce recipe, traditional Meatballs in Almond Sauce recipe, rich Italian Bolognese Sauce recipe, and creamy Chicken Croquettes in Thermomix recipe. When I'm after something heartier, I'll bake this Greek Pastitsio Pie recipe, rustic Potatoes and Squid Stew recipe, or the ultra-comforting French Boeuf Bourguignon recipe.

Anytime I'm in the mood for street food or party-style plates, I'll usually make this juicy Homemade Chicken Doner Kebab recipe, crispy Salchipapas recipe, flavorful Mexican Pork Carnitas recipe, or these crunchy Korean Hobak Jeon recipe. These easy Air Fryer Zucchini Rings recipe also work great as a laid-back appetizer or snack.

And when I'm hosting guests with drinks and a full spread, dinner often gets paired with this refreshing Original Cuban Mojito recipe, this bold Long Island Iced Tea recipe, or a pitcher of this fruity Bleeding Spanish Sangria recipe. To fill out the table, I like adding this tangy French Remoulade Sauce recipe on the side or finishing with this striking Mediterranean Black Rice with Squid recipe.

Even More Tasty Recipes to Cook for the Family

After years of testing and tweaking recipes in my own kitchen, I've come to believe the best dishes are built on simplicity, dependable techniques, and big flavor.

Every recipe in this collection is one I genuinely come back to time and time again—whether it's a fast meal just for me or something special for friends and family.

For dessert, the rich and silky Orange Chocolate Mousse Recipe is a go-to when I want something elegant yet effortless. Another sweet favorite is the caramelized Trdelnik Slavic Pastry Recipe, inspired by the famous Central European chimney cake. If you enjoy baking, knowing how to make syrup for better texture in desserts is useful, and my Inverted Sugar Recipe explains exactly how I prepare it in my own kitchen.

When something fresh and simple is what I'm after, I usually reach for the classic Italian Caprese Salad Recipe or a perfectly cooked Simple Poached Egg Recipe. For heartier comfort meals, I often point people to the satisfying Meatball Sandwich Recipe, the creamy Russian Stroganoff Beef Recipe, and the quick weeknight favorite One Pot Pasta Recipe.

Traditional dishes from around the world are another thing I love to share, including the authentic Sorropotún de Bonito Fish Stew Recipe, crispy Chilean Pumpkin Sopaipillas Recipe, and the classic Spanish Cochifrito Segovian Fried Pig Recipe.

Air fryer recipes are another category I cook often, since they save time while still delivering great texture. My go-to options include Air Fryer Pork Ribs Recipe, Air Fryer Chicken Thighs Recipe, Air Fryer Sweet Potatoes Recipe, Air Fryer Baked Potatoes Recipe, Air Fryer Peppers Recipe, Air Fryer Mixed Sandwich Recipe, Air Fryer Toasted Bread Recipe, and Air Fryer Hard-Boiled Eggs Recipe.

And for anyone steering clear of wheat, my comforting Gluten-Free Lasagna Recipe shows that classic baked pasta can still be rich, cheesy, and completely satisfying without gluten.

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