Dinner

Steak Sarnies with Sticky Onions & Blue Cheese Recipe

ByNoah Steele November 24, 2025November 24, 2025

Introduction

This steak sarnie with sticky onions and blue cheese is a deliciously indulgent sandwich perfect for a satisfying lunch or dinner. Combining tender steak, caramelised onions, and creamy stilton on toasted sourdough, it’s a flavor-packed treat that’s easy to make at home.

The image shows two open sandwich slices on a light blue wooden board placed on a white marbled texture with a red and white striped cloth underneath. Each sandwich has a base layer of toasted bread with a golden crust and light airy holes, topped with thin slices of medium-rare steak, showing a pink center and browned edges. On top of the steak are scattered pieces of blue cheese and fresh green arugula leaves. A white bowl to the right contains dark caramelized onions, with some spilled slightly on the board. Above the board, there is a white bowl filled with fresh green arugula and two glasses filled with amber-colored beer, one cap lying next to the glass on the left. A knife with a wooden handle rests diagonally on the board beside the sandwiches. The photo is taken with an iphone --ar 4:5 --v 7

Ingredients

2 tbsp unsalted butter
1 red onion, thinly sliced

2 tbsp Worcestershire sauce
½ tbsp light brown soft sugar

40g stilton, crumbled
2 tbsp mayonnaise

1 large sirloin or rump steak (about 350g)
4 slices sourdough bread
Handful of rocket, to serve

Freshly ground black pepper, to season
Salt, a pinch

Instructions

Step 1: Melt the butter in a frying pan over medium heat. Add the thinly sliced red onion and a pinch of salt, cooking for about 15 minutes until the onions turn golden brown.

Step 2: Stir in the Worcestershire sauce and brown sugar. Continue frying for another 5 minutes, until the onions are sticky and caramelised. Remove from the heat and set aside.
Step 3: In a small bowl, mix the crumbled stilton with the mayonnaise. Season with freshly ground black pepper and set aside.
Step 4: Season the steak on both sides with salt and pepper. Heat a griddle pan over high heat and cook the steak for 2–3 minutes on each side (2 minutes for rare, 3 minutes for medium).

Step 5: Remove the steak to a board, cover loosely, and leave to rest for 10 minutes before thinly slicing it.
Step 6: Toast the sourdough slices until golden. Spread each slice generously with the blue cheese mixture.
Step 7: Top the cheese-spread bread with slices of steak, caramelised onions, and a handful of rocket. Finish with a grind of black pepper and serve two open-faced sandwiches per person.

Tips & Variations

For extra flavor, marinate the steak in a little Worcestershire sauce and garlic before cooking.
Swap stilton for gorgonzola or another blue cheese if preferred.
Use rye or wholegrain bread for a different bread base.

Add a dollop of horseradish sauce for a spicy kick.

Storage

This sandwich is best enjoyed fresh. If you have leftovers, store the steak and onions separately in airtight containers in the refrigerator for up to 2 days. Reheat the steak gently in a pan or microwave, then assemble the sandwich just before serving to keep the bread crisp.

How to Serve

Two open-faced sandwiches sit on a light blue wooden board placed on a white marbled texture with a red and white striped cloth underneath. Each sandwich has a base of toasted crusty bread with light golden-brown edges. The first sandwich has a layer of cooked thin steak slices topped with dark caramelized onions, scattered blue cheese crumbles, and fresh green arugula leaves. The second sandwich has similar layers with steak slices, caramelized onions, blue cheese crumbles, and arugula on the bread. Near the board is a knife with a wooden handle, a white bowl filled with caramelized onions, a white round bowl with fresh arugula, and two glasses of amber beer with foam bubbles. A woman's hand is partially visible holding one of the sandwiches. photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I use a different type of cheese instead of stilton?

Yes, other blue cheeses like gorgonzola or roquefort work well. You can also use creamy cheeses like goat cheese for a milder flavor.

How do I know when the steak is cooked to medium?

Cooking the steak for about 3 minutes per side on high heat usually results in medium doneness. The steak should be warm and pink in the center. Use a meat thermometer if unsure; medium is around 63°C (145°F).