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Charred Spring Onions with Romesco Sauce

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Smoky, caramelized spring onions are grilled to perfection and served with a bold, nutty Romesco sauce for a vibrant, healthy side dish. This easy recipe is perfect for potlucks, BBQs, or weeknight dinners and comes together in under 30 minutes.

Ingredients

Scale
  • 1 bunch spring onions (about 8–10 stalks), washed and trimmed
  • 1 tablespoon olive oil (for brushing)
  • 1/2 teaspoon kosher salt
  • Freshly ground black pepper, to taste
  • 1/2 lemon, for squeezing (optional)
  • 1 cup roasted red peppers, drained
  • 1/3 cup raw almonds (or roasted almonds)
  • 1 small garlic clove, peeled
  • 2 tablespoons tomato paste
  • 1 tablespoon sherry vinegar (or red wine vinegar)
  • 1/2 teaspoon smoked paprika
  • 1/4 teaspoon cayenne pepper (optional)
  • 1/4 cup olive oil
  • Salt and pepper, to taste

Instructions

  1. Wash and trim the spring onions, removing any wilted layers. Pat dry with paper towels.
  2. Toss onions in a mixing bowl with 1 tablespoon olive oil, 1/2 teaspoon kosher salt, and freshly ground black pepper.
  3. Preheat your grill or grill pan over medium-high heat until hot.
  4. Place onions on the grill in a single layer. Grill for 3-4 minutes per side, until nicely charred and tender. Flip gently with tongs.
  5. While onions grill, add roasted red peppers, almonds, garlic, tomato paste, vinegar, smoked paprika, cayenne (if using), and 1/4 cup olive oil to a food processor. Blend until smooth, scraping down sides as needed. Season with salt and pepper to taste. If sauce is too thick, add a tablespoon of water.
  6. Transfer charred onions to a serving platter. Squeeze half a lemon over the top (optional). Spoon Romesco sauce into a bowl or drizzle over onions. Garnish with extra salt or chopped parsley if desired.

Notes

For nut allergies, substitute almonds with sunflower seeds. If spring onions are unavailable, use scallions, leeks, or thinly sliced baby carrots. Romesco sauce can be made ahead and refrigerated for up to 2 days or frozen for 2 months. For extra flavor, add fresh herbs or a pinch of cumin to the sauce. If onions stick to the grill, brush with more oil and wait before flipping.

Nutrition

Keywords: charred spring onions, romesco sauce, grilled vegetables, easy side dish, gluten-free, dairy-free, healthy, Spanish recipe, vegan, BBQ, summer

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