Gratineed Mustard Creamed Onions
Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 17 Jan 2026
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These gratinéed mustard creamed onions offer a sophisticated twist on a classic vegetable side dish. Sweet pearl onions are simmered until tender before being bathed in a silky, triple-flavoured sauce of Sherry, whole milk and a duo of sharp mustards. The addition of freshly grated nutmeg provides a subtle warmth that cuts through the richness, while a final gratin finish under the grill ensures a beautifully crisp, golden crust of Parmigiano-Reggiano.
This indulgent vegetarian recipe is an excellent accompaniment to a traditional Sunday roast or a festive Christmas dinner. The combination of textures—from the soft, translucent onions to the bubbling cheese topping—makes it a standout addition to any table. It is a deceptively simple yet elegant way to elevate humble ingredients into a comforting and flavourful savoury treat.
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Ingredients for Gratineed Mustard Creamed Onions
900g white pearl onions
2 tablespoons unsalted butter
2 tablespoons plain flour
240ml whole milk
45ml cream Sherry
1 tablespoon grainy mustard
1 tablespoon Dijon mustard
1/4 teaspoons grated nutmeg
120ml grated Parmigiano-Reggiano
Equipment: a 2-qt shallow gratin or other flameproof baking dish (2 inches deep)
How to make Gratineed Mustard Creamed Onions
Cook onions in a large heavy pot of boiling salted water (2 teaspoons salt for 3.8L water) until just tender, 25 to 30 minutes. Reserve 240ml cooking water, then drain (reserve pot). Cool onions to warm, then peel.
Melt butter in dry pot over medium heat. Add flour and cook, stirring, 2 minutes. Whisk in reserved cooking water, milk, and Sherry and cook, whisking frequently, until mixture is thickened, about 8 minutes. Whisk in mustards, nutmeg, and 1/2 teaspoons each of salt and pepper. Add onions to sauce and simmer 5 minutes.
Preheat grill.
Transfer creamed onions to baking dish and sprinkle evenly with cheese. Grill 4 to 5 inches from heat until top is golden brown and bubbling, about 3 minutes.
Descargo de responsabilidad
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.
Historia del artículo
La información de esta página ha sido revisada por médicos cualificados.
17 Enero 2026 | Publicado originalmente
Autores:
Editores de recetas del Reino Unido
Revisado por expertos
Editores de recetas del Reino Unido

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