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Steak sandwiches with sweet potato fries

Name: Steak sandwiches with sweet potato fries
Yield: Serves 2
Cuisine: British recipes
Ingredients: 400g sweet potato, cut into chunky chips or thin wedges; 1 tbsp olive oil, plus extra for frying, drizzling and brushing; 1 large onion, sliced; 1 tsp soft light brown sugar; ½ tbsp balsamic vinegar; 2 x 150g British rump or sirloin steaks; 2 ciabatta rolls, halved; 4 tsp dijon mustard; 40g wild rocket; Juice ½ lemon; 3 tbsp mayonnaise

Published: 25 Sep 18
Updated: 4 Apr 24

Pan-seared beef steak is sandwiched between soft ciabatta buns and served alongside the crispiest sweet potato fries with mustard mayo.

Or, give veggie a go with these beetroot, fennel, apple and dill burgers.

Easy
May 2018

Test kitchen approved

Serves 2
Hands-on time 30 min, oven time 30 min

Pan-seared beef steak is sandwiched between soft ciabatta buns and served alongside the crispiest sweet potato fries with mustard mayo.

Or, give veggie a go with these beetroot, fennel, apple and dill burgers.

Nutrition: per serving

Calories: 845kcals
Fat: 33.1g (5.7g saturated)
Protein: 46g
Carbohydrates: 86.1g (22.2g sugars)
Fibre: 10.7g
Salt: 2.1g

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Ingredients

400g sweet potato, cut into chunky chips or thin wedges
1 tbsp olive oil, plus extra for frying, drizzling and brushing
1 large onion, sliced
1 tsp soft light brown sugar
½ tbsp balsamic vinegar
2 x 150g British rump or sirloin steaks
2 ciabatta rolls, halved
4 tsp dijon mustard
40g wild rocket
Juice ½ lemon
3 tbsp mayonnaise

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Method

Heat the oven to 200°C/180°C fan/gas 6. On a baking tray, season the sweet potato chips and toss with 1 tbsp oil. Bake for 30 minutes until tender but crisp on the outside, tossing once.
Meanwhile, heat a glug of oil in a frying pan over a medium heat. Cook
the onion with a pinch of salt for 10-12 minutes, stirring, until soft and starting to brown. Add the sugar and balsamic vinegar, then bubble for 3-4 minutes until caramelised. Remove from the heat and set aside.
Brush the steaks with oil and season well on both sides. Heat a griddle pan until smoking hot, then fry the steaks for 2-3 minutes on each side or until done to your liking. Remove to a board, cover with foil and leave to rest for 5 minutes.

Wipe the griddle pan clean, then toast the ciabatta rolls, cut-side down, for 3-4 minutes until crisp. Remove and spread each bottom half with 1 tsp dijon mustard.
In a bowl, toss the rocket with a drizzle of oil, a squeeze of lemon juice and some black pepper. Divide between the ciabatta bases. Slice the steak into strips and arrange over the rocket, then top with the onions and ciabatta bun tops.
In a bowl, mix the mayonnaise with the remaining mustard and a little black pepper. Serve the steak sandwiches with the sweet potato fries and mustard mayo on the side.