French onion beef stew with Gruyère gratin recipe | Sainsbury`s Magazine (2024)

Tender steak and caramelised onions, topped off with melting cheesy croutes

Tamsin Burnett-Hall

Tamsin learned the tricks of the trade from cookery legend Delia Smith. A trusted recipe writer for the magazine for over 25 years, she is now our Senior Food Producer, overseeing testing and editing to ensure that every recipe tastes great, is straightforward to follow and works without fail. In her home kitchen, Tamsin creates fuss-free flavour-packed food for friends and family, with baking being her ultimate form of comfort cooking

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Ingredients

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Step by step

1. Cut the beef into 6 equal servings and season well. Heat 1 tablespoon of oil in a casserole, add half the beef and brown over a high heat for 2 minutes on each side, then remove to a shallow bowl. Add a little stock to the casserole and stir to deglaze then pour into the bowl. Repeat with the rest of the beef, adding more oil if needed.
2. Meanwhile, thinly slice the onions. Add another tablespoon of oil and most of the butter to the casserole and stir in the onions and a good pinch of salt. Cook over a high heat for 8-10 minutes until starting to brown, stirring so that they don’t catch. Mix in the rest of the butter with the garlic, sugar and thyme then turn the heat right down and cook the onions for at least 30 minutes until meltingly soft and caramelised.
3. Meanwhile, preheat the oven to 190°C, fan 170°C, gas 5. Cut 12 slices (about 2cm thick) from the baguette, brush with oil on both sides; season. Bake on a baking tray for about 20 minutes until crisp, turning over halfway. Remove and set aside, and reduce the oven temperature to 140°C, fan 120°C, gas 1.
4. Set aside a spoonful of onions for the garnish. Increase the heat then stir the flour into the onions in the casserole and cook for 1 minute. Pour in the wine and bubble for 1 minute, then add the rest of the stock, the bay leaves and seasoning. Return the beef to the casserole, submerging it in the sauce. Bring to a simmer, add a lid; transfer to the oven for 2 hours or until tender.
5. For the gratin topping, combine the eggs, mustard and crème fraîche in a bowl. Season then stir in the Gruyère. When the beef is ready, remove the casserole from the oven and turn the oven up to 200°C, fan 180°C, gas 6.
6. Spread the cheesy gratin topping over the crisp croutes then arrange them on top, slightly overlapping. Bake for 20 minutes, uncovered, until the topping looks molten and golden brown. Scatter on the reserved caramelised onions and extra thyme just before serving.