Charred Cos with Tomatillo Dressing
Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 28 Jan 2026
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This vibrant charred romaine with tomatillo dressing brings a sophisticated, smoky edge to the classic green salad. By quickly searing the lettuce on a hot grill, you transform the crisp leaves, adding a mellow sweetness that pairs perfectly with the punchy, zesty dressing. The combination of charred poblano chillies and creamy avocado creates a wonderful contrast of textures, while the raw white onion provides a sharp, clean finish.
Serving as an impressive vegetarian starter or a light lunch, this dish celebrates fresh, seasonal produce with a nod to Mexican-inspired flavours. The use of Cotija cheese adds a lovely salty crumb, though crumble-firm feta makes an excellent substitute if you cannot find it. Packed with healthy fats and bright citrus notes, it is a refreshing way to elevate your salad repertoire for any garden party or midweek meal.
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Ingredients for Charred Cos with Tomatillo Dressing
1/4 medium white onion, quartered
1 small tomatillo, husk removed
1 jalapeño, sliced, seeds removed
1 garlic clove
1/4 avocado, chopped
1/4 cup chopped fresh coriander leaves
1/4 cup olive oil
1 tablespoon fresh lime juice
Kosher salt
Freshly ground black pepper
1 small poblano chilli
2 heads of cos lettuce, outer leaves removed, halved lengthwise
2 tablespoons olive oil
Kosher salt
1 avocado, chopped
1/4 medium white onion, finely chopped
1 tablespoon fresh lime juice
60g Cotija cheese, finely grated
1 tablespoon chopped coriander stems
How to make Charred Cos with Tomatillo Dressing
Back to contentsBring onion, tomatillo, jalapeño, garlic, and 475ml water to a boil in a small saucepan. Reduce heat and simmer until onion is very tender, 6–8 minutes; let cool. Drain, reserving cooking liquid.
Purée onion mixture with avocado and coriander leaves in a blender. With motor running, gradually add oil and 2 tablespoons cooking liquid and blend until combined.
Add lime juice; season with salt and pepper.
Prepare grill for medium-high heat. Grill poblano, turning occasionally, until charred and blistered, 6–8 minutes. Let cool. Peel and finely chop.
Drizzle cut sides of cos with oil; season with salt. Grill, cut side down, until charred, about 3 minutes. Turn and grill just until warmed through, about 30 seconds.
Spoon dressing onto plates and top with cos, charred side up, avocado, onion, and poblano. Drizzle with lime juice; season lightly with salt. Scatter Cotija cheese and chopped coriander stems over.
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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