These steak fajitas are your answer for a quick weeknight dinner that brings all the flavour to the table! Marinated sirloin steak seared to perfection with peppers, onions and all the avocado and lime! It’s a quick skillet dinner that the whole family will love. Easy prep, big, bold flavours and all served in the pan for easy washing up afterwards. And did I mention that everything is available at Aldi UK shops?! ♥
Easy Spicy Steak Fajitas
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What ingredients do you need for making these super easy steak fajitas or beef fajitas as you may call them?
Let’s break it down really quick.
- Mixed peppers- you can definitely use all one colour here, I just like a mix. But I highly suggest you skip the green peppers because they’re too bitter for a fajita.
- Red onion
- Steak- I use an aged sirloin here because they stay tender and sear really well. But you can use a rump or a skirt steak if you can find it.
- Cajun seasoning- I use this one from Aldi UK because it brings all the flavour without me having to mix spices and get the balance right. This one is perfect for dinner in a hurry. Just the right amount of gentle heat with tonnes of flavour.
- Limes- for the marinade and for the fajitas themselves
- Avocado- because avocado is the best thing you could possibly put on a fajita!
- Greek yoghurt- you can use sour cream here, I just use Greek yoghurt for so many things and sour cream not so much, so it would be wasted.
- Coriander- To bring all these Mexican flavours together.
How to make steak fajitas at home step by step
Mix the marinade. I do recommend marinating the beef for 30 minutes, but if you don’t have that kind of time, then just let the steak sit in the marinade while you slice the peppers and onion. It will still be delicious! The marinade is super easy and consists of cajun spice, lime juice and olive oil. The acid in the lime juice helps to tenderize the steak.
- Heat the pan until very hot. Add a drop or two of olive oil and when the oil shimmers in the pan it’s hot enough. Take the steak out of the marinade and let any excess drip off. Place the steak in the hot pan and sear for about 4 minutes per side or longer if you prefer your steak more well done. Remove from the pan and leave to rest before slicing. Give the pan a quick wipe and place back on the heat for the peppers and onion.
- Slice the peppers into long thin slices and the onions into half-moons. Heat a drop of oil in a cast-iron skillet and get it hot. Add in the onions and let cook until soft and golden brown. About 6-8 minutes. Season with salt to help draw the moisture out of the onions. This helps them brown more easily.
- Add in the peppers and cook until soft. Slice the steak width-wise so you’re slicing across the grain. Place back in the pan and garnish with the avocados, coriander and lime wedges. Place in the table and serve with tortillas and Greek yoghurt.
What steak to use for fajitas?
My personal preference is for using a sirloin. It sears well and is tender enough to cook well done for those who prefer it. Other options are skirt steak, flank steak and rump.
Rump steak is easy enough to find in the UK, and Aldi stocks it as well, so you can give it a try. But skirt steak and flank are much harder to track down in the UK and may require a trip to the butcher.
What to serve with fajitas?
- Greek yoghurt or sour cream
- Use lettuce wraps as low carb or keto option
And these easy, delicious, and quick steak fajitas will have you living your very best weeknight, skillet dinner life forever.
More Weeknight dinners on Savvy Bites
Tools used to make this Steak Fajita Skillet
- Cast Iron Skillet (The skillet pictured is Aldi brand, but they’ve sold out. This one is similar)
A fast weeknight dinner loaded with Mexican flavour and easy prep. One skillet, some ingredients from Aldi UK and dinner is ready in 30 minutes!
- 225g sirloin Steak
- 1 red pepper
- 1 yellow pepper
- 1 red onion
- 1 avocado
- 150g Greek yogurt
- 1 bunch coriander
- 8–10 small flour tortillas (or 5 large)
For the Marinade
- 60ml olive oil
- 1 lime, juice only
- 2 tablespoons cajun spice mix
- Remove the sirloin from the packaging and place in a shallow bowl of pie place. Mix the marinade ingredients and pour over the sirloin being sure to coat both sides of the steak. Leave to marinade for 15 minutes.
- While the steak is marinating, slice the onions and both peppers into long thin strips. Set aside.
- Heat a non stick or a cast iron skillet over a high heat. Remove the steak from the marinade and sear in the hot pan on both sides. Remove the steak and leave to rest. Place the onions in the pan and cook until soft and golden, about 10 minutes. Add the peppers into the pan and cook for a further 10 minutes. Add the marinade and bring to a boil. Once the marinade has reduced to a thick sauce, about 3 minutes remove from the heat.
- Slice the steak width wise, across the grain of the meat, and place in the pan with the peppers and onions.
- Top the tortillas with a tablespoon of Greek yogurt, and the steak and peppers. Sprinkle with the coriander and serve with extra lime wedges and avocado.
If you don’t have time to marinate, that’s no problem. Just leave the steak in the marinade while you prep the other ingredients and sear according to the instructions!
- Category: Easy Dinner
- Method: Searing
- Cuisine: Mexican
Keywords: Easy dinner, skillet, cast iron, steak, weeknight
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