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  • Writer's pictureRomyL

Caramelised Onion & Steak Sandwich, Loaded with Crispy Sweet Potato Fries & Roasted Red Peppers

Makes 6 Sandwiches


This is going to sound pretentious as hell but here goes. When I was 16 I went on a school trip to Verbier, Switzerland. It was my first time to Europe and my second time skiing ever. I did an intensive week learning to Ski (it was pretty insane). During some of my off time I came across a sandwich shop called Haut's Sandwich. A pokey little hut-like store with a dulled red sign. I had their steak sandwich with fries and peppers and OH MY LADY LORD. I can't believe I hadn't thought to recreate it until now but I'm glad I waited. It was like losing my sandwich virginity all over again. I can't stress how delicious this sandwich is; and honestly, if you don't eat steak, there are so many other options you could plonk in there for an equally delicious sammy.

I don't quite know why you're hesitating...

Go make it now please.

Thank you.


  • Blue cheese isn't for everyone, if you don't like the sharp taste then feel free to skip this step! You could make a garlic and parsley butter as a substitute or simply use mustard.

  • The thicker you cut your sweet potatoes, the more cooking time you will need on each side, so make sure to adjust for this.

  • If you aren't partial to sweet potato fries, regular fries are also a dream in this sandwich.



Blue Cheese Butter

  • 1/2 cup of blue cheese

  • 1/4 cup of fresh parsley, finely chopped

  • 1/2 cup of softened butter

Caramelised Onions

  • 3 large onions, sliced (white or red)

  • 3 tablespoons of butter

  • 2 tablespoons of brown sugar

  • 1 tablespoon of balsamic vinegar

  • A pinch of salt & black pepper


  • 1 tablespoon of vegetable oil

  • 3-4 scotch fillet or sirloin steaks

  • Salt & Pepper


  • 1 large sweet potato

  • 2 tablespoons of mild olive oil

  • 2 tablespoons of garlic powder

  • 2 teaspoons of salt

  • 2 teaspoons of black pepper

  • 1/4 cup of fresh parsley, finely chopped

  • 1 red pepper, sliced

  • 1 yellow pepper, sliced

  • 5 sprigs of thyme

  • 6 ciabatta buns

  • 6 tablespoons of softened butter

  • 2 cups of watercress or arugula

  • 6 tablespoons of ketchup


Blue Cheese Butter

  1. Mix together the softened butter, parsley and crumbled blue cheese until it makes a cohesive butter (may take a little bit of elbow work).

  2. Place the butter in the fridge until you're ready to use it.

Caramelised Onions

  1. Melt your butter in a frying pan over a low heat.

  2. Stir in your onions and then cover with a lid for 20 minutes, stirring occasionally.

  3. Add in your sugar, vinegar, salt & pepper. Cook for a further 10 minutes.

  4. Set aside until ready to use.


  1. Take the steak out of the fridge 15-20 minutes before cooking

  2. Season the steak generously with salt and pepper

  3. Place a skillet over a high heat with your vegetable oil. Once the oil is hot, add in your steak. Cook the steak to your preferred doneness.

  4. Once removed from the pan, place the steak on a plate and cover it with foil for 5-10 minutes. Then slice the steak against the grain - I prefer thicker slices but thin slices are also delicious.


  1. Preheat your oven to 220℃.

  2. Cut your sweet potato into 1cm thick fries. Try to cut them as evenly as possible so that the cooking is even. Place the fries into a large bowl of cold water for at least 30 minutes but you can leave them for up to 6-8 hours if you need.

  3. Take the fries out of the water and dry them thoroughly. Toss them in 1 tablespoon of olive oil, 1 tablespoons of garlic powder, 1/2 a teaspoon of salt, and 1/2 a teaspoon of black pepper.

  4. Line a large baking sheet with baking paper. Place the fries on the baking paper leaving space between each fry.

  5. Place in the oven for 20 minutes, flip them over, and bake for another 20 minutes or until crispy. When they come out of the oven, sprinkle over 1/4 cup of parsley.

  6. Meanwhile, toss your red and yellow pepper slices in the remaining oil, garlic powder, salt & pepper. Mix in your fresh thyme.

  7. Using the same baking tray, lay your red and yellow peppers down. Bake in the oven for 20 minutes or until slightly charred and roasted.

  8. It's time to layer up your sandwich. Slice the Ciabatta buns in half. Spread 1 teaspoon of butter over each side. Toast the buns on a frying pan on a medium-high heat (cut-side down) for 5 or so minutes.

  9. Once toasted, spread a tablespoon of blue cheese butter on one side. Spread a tablespoon of ketchup on the other side. Lay down a large spoonful of onions. Layer on the steak, fries, pepper, watercress, and any other sauces or additional toppings you like!


Stay Salty,

Romy xx

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