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How to make an authentic spanish tortilla: with or without onion? The debate is on!

The Spanish tortilla, also known as tortilla de patatas, is undeniably one of the most iconic dishes in Spanish cuisine. A simple, delicious delicacy that, surprisingly, always finds itself at the heart of a heated debate! While everyone agrees it's delicious, the big question remains: should it include onion or not? Today, at Trastienda Market, we make it easy for you: choose your side and prepare it just the way you like!



Who would have thought? A tiny ingredient like the onion has the power to spark discussions as intense as a soccer championship final. But hey, we’re not here to pick sides because at the end of the day, the tortilla is mouthwateringly good, with or without onion!  


The origin of the spanish tortilla: simplicity at its best  


The spanish tortilla has humble origins, born out of the need to create an affordable and satisfying dish. It consists of just three basic ingredients: potatoes, eggs, and olive oil. But, ah! While some swear by the traditional recipe without onion, others insist onion is the secret ingredient that takes the tortilla to another level. Onion not only adds a touch of sweetness but, when cooked slowly, provides a soft texture that makes every bite a delightful experience.  


With onion or without onion? The eternal debate 


Dare to ask the question at any Spanish table, and you're bound to stir up a clash of opinions. Here's a breakdown of the two camps to help you decide (or you can be daring and join the onion revolution): 



Team onion:  


Onion lovers argue that without it, the tortilla is incomplete. For them, caramelized onion brings a soft, sweet flavor that transforms the tortilla from delicious to sublime. They believe the onion's sweetness balances the potatoes' starchiness and adds a melt-in-your-mouth juiciness. A true bite of happiness!  


  • Tip for team onion: add a pinch of salt at the beginning and cook the onion on low heat to caramelize it slowly. This technique gives the tortilla a unique flavor that might just convince even the staunchest no-onion fans.  


Team no onion:  


Purists and traditionalists firmly believe that the Spanish tortilla should NOT include onion. For them, onion distracts from the pure taste of potatoes and eggs—the true stars of the dish. They stand by the original recipe, which they see as simple and perfect. Why complicate something that's already so good?


  • Tip for team no onion: to master the no-onion version, focus on perfectly cooking the potatoes. Use high-quality extra virgin olive oil, and aim for potatoes that are soft but not mushy, with no crispiness.  


How to make a spanish tortilla (with or without onion)  


No matter which side you’re on, here’s how to make an authentic Spanish tortilla:  


Ingredients:  


  • 6 medium potatoes

  • 8 eggs  

  • Extra virgin olive oil (the better the quality, the tastier the tortilla)  

  • Salt

  • Optional: 1 large onion (if you dare to join Team Onion)  


Instructions:  


  1. Prepare the potatoes: peel and thinly slice the potatoes. If you're Team Onion, slice the onion into thin strips (tears are part of the fun!). Fry the potatoes and onion (if used) in plenty of olive oil over medium heat. Cook them slowly so they become tender and juicy without browning too much.

  2. Drain the oil: once the potatoes (and onion) are ready, use a slotted spoon to remove them and drain the excess oil in a colander. Let them cool slightly before mixing with the eggs.  

  3. Beat the eggs: in a large bowl, beat the eggs with a pinch of salt. Add the potatoes and onion (if used) and mix well, ensuring everything is coated in the egg.  

  4. Cook the tortilla: heat a bit of olive oil in a nonstick pan. Pour in the mixture and cook over medium heat for 3–4 minutes, until the edges start to set. Using a large plate, carefully flip the tortilla and cook the other side for another 2–3 minutes.  

  5. Enjoy: serve it hot or at room temperature, and get ready to savor this ultimate Spanish dish!  




So, which side are you on?  


Whether you're team onion or team no onion, the Spanish tortilla is always a crowd-pleaser and a proud symbol of Spanish cuisine. The debate over onions is a matter of taste, but one thing’s for sure: both versions have their charm. Ready to whip up your favorite? Head over to Trastienda Market to stock up on the finest olive oil and other Spanish essentials for your tortilla adventure!


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