Celeriac Rösti with Harissa Yogurt

The smell of celeriac frying in olive oil caught me off guard the first time I tried it. I'd bought the knobby root on a whim at the market, unsure what to do with it. A friend suggested treating it like potatoes, and that's how these rösti came to be. The edges crisped up beautifully, and the slightly sweet, earthy flavor was nothing like I expected. Now, it's my go-to when I want something familiar but different.

I made this for a Sunday brunch last autumn when friends dropped by unexpectedly. I had celeriac left over from a soup and eggs in the fridge. The harissa yogurt was a last-minute idea, inspired by a half-used jar in the door. Everyone went quiet after the first bite, then asked for seconds. It's been my secret weapon for casual entertaining ever since.

Ingredients

• Celeriac: This gnarly root has a mild celery-like flavor and crisps beautifully when grated and fried, adding earthy sweetness to the rösti.
• Potatoes: They bind the mixture and give structure, helping the rösti hold together while frying without falling apart.
• Onion: Finely grated onion adds moisture and a subtle sharpness that balances the sweetness of the celeriac.
• Parsley: Fresh parsley brings brightness and a hint of green that cuts through the richness of the fried egg and yogurt.
• Flour: Just enough to bind the grated vegetables together without making the rösti heavy or doughy.
• Egg: Acts as the glue that holds everything in place, ensuring each rösti stays intact during frying.
• Olive oil: Use a good quality oil for frying, it adds flavor and helps achieve that golden, crispy crust.
• Greek yogurt: Thick and tangy, it's the perfect creamy base for the harissa without being too heavy.
• Harissa paste: This North African chili paste brings smoky heat and depth, transforming plain yogurt into something exciting.
• Lemon juice: A little acidity brightens the yogurt and balances the richness of the egg yolk.
• Butter or olive oil for eggs: I prefer butter for frying eggs, it adds a nutty richness that olive oil can't quite match.

Instructions

Squeeze Out the Moisture:

Place the grated celeriac and potato in a clean kitchen towel and twist it tightly over the sink, squeezing out every drop of liquid you can. This step is crucial for crispy rösti, excess water will make them soggy and they won't hold together properly.

Mix the Rösti Base:

In a large bowl, combine the squeezed-out vegetables with grated onion, chopped parsley, flour, egg, salt, and pepper, mixing with your hands until everything is evenly distributed. The mixture should feel slightly sticky but not wet.

Fry the Rösti:

Heat half the olive oil in a non-stick pan over medium heat, then scoop heaped tablespoons of the mixture into the pan, flattening each one gently with the back of a spoon. Fry for 4 to 5 minutes per side until deep golden and crisp, working in batches and adding more oil as needed.

Keep Them Warm:

Transfer cooked rösti to a plate lined with paper towels to drain excess oil, then keep them warm in a low oven while you finish the rest. This way, everything stays hot and crispy when you're ready to serve.

Make the Harissa Yogurt:

In a small bowl, stir together Greek yogurt, harissa paste, lemon juice, and a pinch of salt, tasting and adjusting the heat and seasoning to your liking. It should be creamy, tangy, and have a gentle spicy kick.

Fry the Eggs:

Heat butter or oil in a clean pan over medium heat, crack in the eggs, and fry until the whites are set but the yolks are still runny, seasoning with salt and pepper. I like my yolks soft so they mix into the yogurt and rösti when I cut into them.

Assemble and Serve:

Place a few rösti on each plate, add a generous dollop of harissa yogurt, and top with a fried egg. Scatter over extra parsley and serve with lemon wedges on the side for squeezing.

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One morning, my daughter asked why the rösti smelled different from regular hash browns. I realized it was the celeriac, with its faint celery sweetness and earthy warmth. We started calling them fancy hash browns, and now she requests them for her birthday breakfast. It's funny how a vegetable I once avoided became part of our little traditions.

Getting the Texture Right

The secret to truly crispy rösti is patience and a hot, but not smoking, pan. I used to rush and crank the heat, ending up with burnt edges and raw middles. Now I let them cook slowly, listening for the sizzle to stay steady. When the edges start to brown and pull away from the pan, that's when you know they're ready to flip. The smell changes too, from raw starch to toasted, nutty goodness.

Adjusting the Harissa Yogurt

Harissa pastes vary wildly in heat, so start with a teaspoon and build up. I once added the full amount without tasting and it was too fiery for breakfast. Now I mix, taste, and adjust with more lemon or a touch of honey if it's too spicy. The yogurt should have warmth and complexity, not just burn. It's also lovely with a pinch of cumin stirred in for extra depth.

Serving and Storing Tips

These rösti are best eaten immediately while they're still crisp, but if you have leftovers, reheat them in a hot oven rather than the microwave. The microwave makes them soggy, but a few minutes at 200°C brings back some of that crunch. The harissa yogurt keeps for up to three days in the fridge and actually tastes better after the flavors meld overnight.

• Try adding a handful of grated Gruyère to the rösti mixture for a richer, cheesier version.
• Swap the fried egg for poached if you want a lighter, more elegant presentation.
• Serve with sautéed greens or a simple arugula salad to balance the richness.

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There's something deeply satisfying about breaking into a runny yolk and watching it mingle with spicy yogurt and crispy vegetables. This dish feels like a small celebration, even on an ordinary Tuesday.

Recipe FAQs

→ Can I prepare the rösti mixture ahead of time?

Yes, you can prepare the mixture up to 2 hours in advance. Keep it refrigerated and squeeze out any excess liquid again before frying to ensure crispy results.

→ What can I substitute for celeriac?

You can use all potatoes, sweet potatoes, or parsnips instead of celeriac. Each will give a slightly different flavor but will still create delicious crispy patties.

→ How do I make these dairy-free?

Replace the Greek yogurt with coconut yogurt or cashew-based yogurt. The harissa paste and eggs can remain the same for a dairy-free version.

→ Can I bake these instead of frying?

Yes, brush the rösti with oil and bake at 200°C (400°F) for 20-25 minutes, flipping halfway through. They won't be quite as crispy as pan-fried but still delicious.

→ How spicy is the harissa yogurt?

The spice level is moderate. Start with 1 tablespoon of harissa paste and adjust to taste. You can add more for extra heat or reduce it for a milder version.

→ What's the best way to squeeze liquid from the vegetables?

Use a clean kitchen towel or cheesecloth. Gather the grated vegetables in the center, twist tightly, and squeeze firmly over the sink until no more liquid comes out.