Hungarian Sirloin with Crispy Onions & Rosemary Mashed Potatoes (Hagymás Rostélyos)

This classic Hungarian dish brings together tender, seared sirloin, golden, crispy onions, and smooth, rosemary‑infused mashed potatoes for a comforting yet elegant meal.

The beef is marinated in mustard and gently pan‑seared to keep it juicy, while the onions are fried until perfectly crisp for a traditional touch.

Paired with creamy, aromatic mashed potatoes, this recipe offers a beautiful balance of rich flavors and homestyle warmth — ideal for family dinners or a refined weekend meal.

This hearty Hungarian beef dish pairs beautifully with a chilled bowl of Hungarian Sour Cherry Soup (Meggyleves). The light, fruity sweetness of the soup balances the richness of the seared sirloin and crispy onions, creating a refreshing and traditional two‑course Hungarian meal.

Hungarian Sirloin with Crispy Onions and Rosemary Mashed Potatoes

A classic Hungarian-style beef dish with crispy onions and creamy rosemary mashed potatoes.
Prep Time 15 minutes
Cook Time 45 minutes
Resting time 10 minutes
Total Time 1 hour 10 minutes
Servings: 4
Course: Main Course
Cuisine: Hungarian
Calories: 2029

Ingredients
  

  • 1.3 lbs. beef sirloin (4 slices), 600 g
  • Salt to taste
  • Black pepper to taste
  • 8 tbsp mustard
  • ¾ cup of sunflower oil
Crispy Onions
  • 6 medium onions
  • 1 ⅔ cups of all-purpose flour
  • Salt to taste
  • 3 cups of sunflower oil for frying
Rosemary Mashed Potatoes
  • 4 sprigs fresh rosemary
  • 2.2 lbs. 2.2 lb potatoes
  • Salt to taste
  • Black pepper to taste
  • Freshly grated nutmeg to taste
  • 10 tbsp butter
  • ¾ cup warm milk

Method
 

  1. For the Beef

    Season both sides of the beef slices with salt and pepper.
    Generously coat each piece with mustard.
    Place the slices in a dish, drizzle with the sunflower oil, cover, and let them marinate for at least a few hours (overnight is even better).
    When ready to cook, heat a pan with a little butter or oil.
    Sear the beef slices for about 3 minutes per side, until nicely browned.
    Set aside and keep warm while preparing the sides.
🧅 For the Crispy Onions
  1. Peel the onions and slice them into thin ½ cm (¼ inch) rings.
    In a bowl, mix the flour with a pinch of salt.
    Toss the onion rings in the seasoned flour, shaking off any excess.
    Heat the sunflower oil in a pot.
    Fry the onions in batches until golden and crispy.
    Transfer to paper towels to drain.
🥔 For the Rosemary Mashed Potatoes
  1. Cook the potatoes whole, with skins on, in salted water until tender.
    Meanwhile, melt 1 tablespoon of butter in a small pan and gently warm the rosemary sprigs to release their aroma. Remove the stems and finely chop the leaves.
    Peel the cooked potatoes and mash them while still warm.
    Season with salt, pepper, and a touch of nutmeg.
    Add the chopped rosemary, the remaining butter, and the warm milk.
    Mix until smooth, creamy, and fluffy.
  2. Serve
    Place a portion of rosemary mashed potatoes on each plate, top with the seared beef slices, and finish with a generous handful of crispy onions.
    A warm, comforting, beautifully balanced Hungarian dish — elegant enough for guests, simple enough for a cozy family dinner.

Nutrition

Calories: 2029kcal

Notes

  • This dish works best with well‑marbled sirloin, as it stays tender during quick searing.
  • Make sure to coat the onions lightly so they fry up crisp and golden.
  • For the mashed potatoes, warming the milk and butter helps create a smooth, creamy texture, while the rosemary adds a fresh, aromatic finish.
        Good appetite,

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