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Charred Onion Dip

This charred onion dip is a sophisticated take on a classic party favourite. By grilling a medley of leeks, shallots and spring onions until they are deeply caramelised and smoky, you create a complex savoury base that far surpasses shop-bought versions. The sweetness of the charred vegetables balances beautifully with the tangy soured cream and lemon, making it an irresistible addition to any appetiser spread or summer barbecue.

Ideal as a vegetarian snack or a side dish for entertaining, this versatile dip pairs perfectly with crunchy sea salt crisps, toasted sourdough or fresh vegetable crudités. The addition of buttermilk ensures a silky texture that feel indulgent yet light. Simple to prepare ahead of time, it is a reliable choice for hosting friends or enjoying as a weekend treat.

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Ingredients for Charred Onion Dip

  • 1 thinly sliced shallot

  • 1 thinly sliced leek

  • 2 thinly sliced spring onions

  • 2 tablespoons olive oil

  • 1 grated garlic clove

  • 120ml mayonnaise

  • 120ml soured cream

  • 2 teaspoons fresh lemon juice

  • 1 teaspoon chopped thyme, plus more for topping

  • 2 tablespoons buttermilk

  • Salt

  • Pepper

Heat grill. Toss 1 thinly sliced shallot, 1 thinly sliced leek, and 2 thinly sliced spring onions with 2 tablespoons olive oil; season with salt. Grill, tossing once, until charred, 10-15 minutes. Let cool. Mix with 1 grated garlic clove, 120ml mayonnaise, 120ml soured cream, 2 teaspoons fresh lemon juice, and 1 teaspoon chopped thyme. Thin with 2 tablespoons buttermilk; season with salt and pepper. Serve topped with thyme.

Disclaimer

While every effort has been made to ensure the information is accurate and up to date, individual needs may vary and dietary requirements can differ based on personal health conditions. Always check food labels and allergen information before preparing or consuming any recipe. If you have specific health concerns, allergies, intolerances, or are following a medically prescribed diet, seek advice from your GP, pharmacist, or a registered dietitian before making significant changes to your diet or lifestyle.

Article history

The information on this page is peer reviewed by qualified clinicians.

  • 28 Jan 2026 | Originally published

    Authored by:

    UK recipe editors

    Peer reviewed by

    UK recipe editors
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