Romesco is a thick, blender-friendly Spanish sauce built from roasted peppers, tomatoes, toasted nuts, and smoked paprika. It takes about 50 minutes start to finish, most of which is hands-off oven time. Make it once and you’ll find yourself putting it on everything from grilled chicken burgers to roasted vegetables to crusty bread.
The short version of why this works
Two things drive this recipe. First, roasting the cherry tomatoes low and slow at 180°C (356°F) concentrates their flavor and removes excess water — skip that step and the sauce turns thin and flat. Second, the toasted bread isn’t just filler; it absorbs the olive oil and binds the nuts into a cohesive, spreadable texture rather than a grainy paste. Process the nuts and bread together first, before adding the wet ingredients, and you get a much smoother result without having to push anything through a sieve. Skip the sieve step unless you genuinely need a restaurant-smooth finish — for burgers and sandwiches, the slight texture is an asset.
Shopping notes
- Smoked paprika (pimentón): Regular sweet paprika won’t cut it here — the smoky version is doing real work. Most grocery stores carry it in the spice aisle; La Chinata is a reliable brand if you have options.
- Hazelnuts: Buy them pre-skinned if you can find them. Blanching and rubbing off hazelnut skins yourself adds 10 minutes you don’t need on a weeknight.
- Sherry vinegar: If you can’t find it, a good red wine vinegar works fine. Balsamic is too sweet — avoid it.
- Roasted red bell peppers: Jarred peppers are a legitimate shortcut here. Drain them well and pat dry so they don’t water down the sauce.
- Rustic bread: One slice of sourdough or a sturdy country loaf is ideal. Soft sandwich bread turns gummy in the processor.
Troubleshooting
- Sauce is too thick to blend smoothly: Add a teaspoon of water at a time while the processor is running. Don’t add extra olive oil to loosen it — you’ll throw off the balance and make it greasy.
- Sauce tastes bitter: Over-toasted nuts are usually the culprit. Pull them off the heat as soon as they smell nutty and turn golden — another 60 seconds and they’re done.
- Sauce is too acidic: A pinch of sugar fixes this faster than adding more oil or nuts. Add it in tiny increments and re-taste.
- Garlic flavor is too sharp or raw-tasting: Make sure the garlic is fully roasted, not just warmed through. It should be soft enough to squeeze out of the skin. Raw or under-roasted garlic will dominate the whole batch.
- Sauce separates after sitting: Give it a good stir before serving. If it’s been in the fridge, let it come to room temperature first — cold olive oil is what causes the split.
Leftovers and meal prep
Romesco keeps well in an airtight container in the fridge for up to five days. Press a piece of plastic wrap directly onto the surface before sealing the lid — this slows oxidation and keeps the color bright. For longer storage, freeze it in an ice cube tray, then transfer the frozen portions to a zip-lock bag; individual cubes thaw in about 20 minutes at room temperature and are perfect for spreading on a single burger or stirring into a quick weeknight sauce. The flavor actually improves after a day in the fridge, so making it the night before is a smart move.
Spanish Romesco Sauce
Ingredients
- 2 tablespoons olive oil extra virgin
- 1 cup cherry tomatoes ripe and halved
- 2 pieces red bell peppers large and roasted, skins removed
- 2 cloves garlic roasted
- ½ cup almonds toasted
- ¼ cup hazelnuts skinned and toasted
- 1 slice rustic bread toasted
- 1 tablespoon sherry vinegar
- 1 teaspoon smoked paprika for authentic flavor
- ½ teaspoon sea salt
- ¼ teaspoon black pepper freshly ground
Instructions
- Preheat your oven to 180°C (356°F). Spread the cherry tomatoes on a roasting tray, drizzle with 1 tablespoon of olive oil, and roast for 25 minutes until they are caramelized and slightly shriveled.
- In a food processor, combine the roasted bell peppers, roasted garlic, toasted almonds, hazelnuts, and bread. Blitz until the mixture resembles fine breadcrumbs.
- Add the roasted tomatoes, sherry vinegar, smoked paprika, sea salt, and black pepper to the processor. While pulsing, slowly drizzle in the remaining 1 tablespoon of olive oil until the sauce is thick and smooth.
- Adjust seasoning if necessary, adding more salt or vinegar to taste. Your goal is a balancing act between nutty richness and a bright tang.
Notes
Nutrition
Your questions, answered
Can I use store-bought roasted red peppers instead of roasting my own?
Yes, jarred roasted red peppers work well and save meaningful time. Just drain and pat them dry thoroughly — excess brine will make the sauce watery and dull the smoky flavor.
Can I make this without a food processor?
A high-powered blender works fine. If you only have an immersion blender, chop the nuts and bread as finely as you can by hand first, then blend everything together — it’ll be a bit more rustic but still good.
How do I use romesco on a burger specifically?
Spread it directly on the bun in place of mayo or mustard — about a tablespoon per side is plenty. It pairs especially well with grilled chicken burgers, veggie patties, and smoky beef burgers where you’d normally reach for a chipotle sauce.
My almonds and hazelnuts are raw, not toasted. Can I still use them?
Toast them yourself in a dry skillet over medium heat for 4 to 5 minutes, stirring constantly. Raw nuts will give you a pale, bland sauce — toasting is not optional.
Is there a nut-free version?
You can replace the nuts with an equal volume of toasted sunflower seeds. The texture will be slightly less rich but the sauce still holds together and tastes good.
Can I double the batch and freeze half?
Absolutely — this recipe scales up without any issues. Freeze in small portions (an ice cube tray is ideal) so you can thaw only what you need rather than the whole batch.