Roasted Asparagus with Hazelnut Romesco

Red peppers blackening in the oven. Three jars of stuff in the blender. Asparagus that actually snaps. Had leftover hazelnuts and cherry peppers. This happened.

Why You’ll Love This Roasted Asparagus Recipe

Takes just over an hour start to finish. The sauce tastes spicy and complex — but it’s literally five ingredients blended together. Works as a side for grilled chicken or fish. Stands alone as a vegetarian dinner too. Hazelnuts give it something nobody expects. Toasted quinoa adds a crunch that shouldn’t exist in a sauce. Tastes better the next day. Maybe best cold.

What You Need for Hazelnut Romesco with Roasted Asparagus

Two red bell peppers. Skin side up, halved, seeded. One hot cherry pepper — whole. Not optional if you want the spicy part to actually work. A quarter cup of olive oil plus a tablespoon more. One medium plum tomato, chopped. Not cherry tomatoes. Different flavor. A quarter cup of toasted hazelnuts — buy them that way, don’t bother toasting yourself. One garlic clove. Smoked paprika. A quarter teaspoon. Ground cumin. An eighth. Three tablespoons of toasted quinoa. It sounds weird. Do it anyway. Two teaspoons sherry vinegar. Salt and black pepper. A small pinch of smoked chili flakes if you like heat more than the cherry pepper gives you.

One and a half pounds of asparagus, trimmed. One bunch of scallions. A tablespoon of olive oil. Salt. Pepper.

How to Make Roasted Asparagus with Red Pepper Romesco

Oven goes to 225 Celsius—that’s 440 Fahrenheit. Rack in the middle. Line your sheet with parchment. Doesn’t matter much but cleanup’s easier.

Place the bell pepper halves skin side up on the sheet. Whole hot pepper too. Drizzle with a tablespoon of olive oil. Toss it around so everything’s coated. Roast for 30 minutes. Watch the last 5 minutes. Skin should bubble and blister. Black spots are good. Actually burned is not. You’ll know the difference.

Transfer everything to a bowl. Cover it tight with foil. Let it sit 10 to 15 minutes. Steam does the work here—skins separate from flesh without you doing anything. Peel them off with your fingers. A paring knife if your fingers get tired.

Blender time. Rough blend the peppers, tomato, hazelnuts, garlic, smoked paprika, cumin, quinoa, vinegar, and the remaining quarter cup of olive oil. Don’t over-blend. Semi-smooth. Keep some texture. Looks rustic, not like baby food. Season with salt and pepper. Add chili flakes if you want it spicier.

How to Get Charred Asparagus with the Right Snap

Same baking sheet. Wipe it if there’s too much char. Toss asparagus and scallions with a tablespoon of olive oil, salt, pepper. Spread in one layer.

Roast 12 to 18 minutes. Turn them halfway through. Thinner spears finish sooner. Watch those. Tips should caramelize—browning at the edges. The stalk bends but doesn’t fall apart. That snap matters. Overcooked asparagus tastes like wet string.

Pull them out when they’re done.

Vegetarian Roasted Asparagus Dinner Tips and Common Mistakes

The peppers won’t fully char if you skip the steam step. Don’t rush that 10 minutes. Just don’t. The skin won’t come off clean and you’ll end up with specks in your sauce that shouldn’t be there.

Blend the romesco the day before if you want. Tastes better with time. Flavors settle.

Asparagus gets soggy if you leave it on the sheet after roasting. Transfer it right away. Or roast it first, let it sit, then reheat with the sauce if you’re not eating immediately.

The sauce breaks a little if it gets too hot again. Serve warm or room temperature. Cold works too. Actually works better cold.

Scallions burn faster than asparagus. Thinner. Watch them. Pull them out first if they’re getting too dark.

Toasted quinoa does something no other grain does here. It’s not a substitute situation. It’s the actual ingredient. Buy it toasted or toast it yourself for five minutes in a dry pan.

Roasted Asparagus with Hazelnut Romesco

By Emma

Prep:

30 min

Cook:

35 min

Total:

1h 5min

Servings:

6 servings

Ingredients

• Romesco Sauce
• 2 red bell peppers, halved and seeded
• 1 hot cherry pepper
• 1/4 cup olive oil plus 1 tablespoon
• 1 medium plum tomato, chopped
• 1/4 cup toasted hazelnuts
• 1 garlic clove, peeled
• 1/4 teaspoon smoked paprika
• 1/8 teaspoon ground cumin
• 3 tablespoons toasted quinoa
• 2 teaspoons sherry vinegar
• Salt and black pepper to taste
• Small pinch smoked chili flakes (optional for more heat)
• Asparagus and Scallions
• 1 1/2 pounds asparagus, trimmed
• 1 bunch scallions, trimmed
• 1 tablespoon olive oil
• Salt and black pepper

Method

1. Romesco Sauce
2. 1 1 Preheat oven to 225 C (440 F) with rack in middle. Line baking sheet with parchment paper.
3. 2 2 Place bell pepper halves skin side up and whole hot pepper on sheet. Drizzle with 1 tablespoon olive oil, toss to coat. Roast about 30 minutes, peeling skin will bubble and start to char. Watch closely last 5 minutes, skin should blister black spots but not burn.
4. 3 3 Transfer hot veggies to airtight container or bowl covered tightly with foil. Let sit 10-15 minutes. Steam loosens skins, easy peeling separates flesh from seeds and pepper membranes. Peel skins off carefully with fingers or paring knife.
5. 4 4 In blender or food processor, roughly blend peppers, tomato, hazelnuts, garlic, smoked paprika, cumin, toasted quinoa, sherry vinegar, and remaining olive oil. Season with salt, pepper, optional chili flakes. Blend to semi-smooth but keep some texture. Sauce should look rustic, not puree.
6. Asparagus and Scallions
7. 5 5 On same baking sheet (wipe if needed), toss asparagus and scallions with olive oil, salt, and pepper. Spread evenly in one layer.
8. 6 6 Roast 12-18 minutes turning halfway or when tips start to caramelize. Should be tender yet have snap when sliced. If thin spears watch closer.
9. 7 7 Transfer asparagus and scallions to platter lined with half the romesco sauce. Arrange veggies on top, drizzle with remaining sauce on the side or spoon over.
10. 8 Serve warm or room temp with grilled meats or as standalone starter.

Nutritional information

Calories

180

Protein

4g

Carbs

12g

Fat

14g

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Frequently Asked Questions About Asparagus Romesco

Can I make the romesco sauce ahead? Yeah. Day before is fine. Flavors get better, actually. Store it in a jar, sealed, in the fridge. Lasts about five days. Might get thicker—just stir in a teaspoon of water if it does.

What if I can’t find hot cherry peppers? Jalapeños work. Half a jalapeño. They’re spicier. Or use a teaspoon of chili flakes blended in. Won’t give you the same pepper flavor but the heat works.

Can I roast everything at once instead of doing peppers first? No. Peppers need 30 minutes. Asparagus needs 12 to 18. They don’t time together. You could theoretically do peppers for 15 minutes first, then add asparagus for the last 12 to 15. Honestly? Separate pans. Cleaner.

Is this actually vegetarian? Yes. No meat anywhere. The hazelnut romesco is the whole dish. Asparagus is the canvas. Works as a main or a side. Serve it with grilled chicken if you want protein. Doesn’t need it though.

Do I have to use toasted hazelnuts or can I toast them myself? Buy them toasted. Toasted hazelnuts have flavor. Raw ones taste like nothing. If you only find raw, toast them in a 350-degree oven for 8 minutes, stirring once. Cool before blending.

Can I make this less spicy? Skip the hot cherry pepper entirely. Use a regular red pepper instead. Still 6 peppers total, just no heat. The smoked paprika stays because that’s not spicy, it’s flavor. Chili flakes are optional anyway.

Does this reheat okay? The sauce reheats fine. The asparagus? Better cold or room temperature. Reheating makes it softer. If you want it warm again, do it in a low oven for 5 minutes. Not the stovetop.