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French onion toasties recipe

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These classic toasties are inspired by the flavours of French onion soup – the delicious caramelised onions giving added oh là là! With a melting mozzarella and Gruyère centre and pan-fried in butter for a crisp finish, this is a cut above your usual sandwich! See method

Serves 4
Takes 1 hr
435 calories / serving
Freezable
Vegetarian

Ingredients

50g butter
1 tbsp olive oil
500g pack frozen sliced red onions
pinch of salt
6 thyme sprigs, leaves picked
1 tbsp brandy, balsamic vinegar or white wine
a few splashes of Worcestershire sauce
4 slices Tesco Finest white sourdough
100g reduced-fat mozzarella, torn
80g Tesco Finest Gruyère, sliced

If you don't have red onions, try using white, brown or spring onions

Each serving contains

Energy
1815kj
435kcal 22%
Fat
25g 35%
Saturates
13g 66%
Sugars
9g 10%
Salt
1.3g 22%

of the reference intake
Carbohydrate 32g Protein 16.9g Fibre 5.3g

Method

Melt 20g butter and oil in a lidded frying pan over a medium-high heat. Add the frozen onions, cover and defrost for 5 mins.
Once defrosted, uncover and cook on high for 3-5 mins until most of the liquid has evaporated. Reduce the heat to low, add the salt and half the thyme leaves; cover and cook for 35-40 mins until caramelised. Add the brandy (or balsamic vinegar or white wine), increase the heat to medium; cook for 3 mins. Season; add splashes of Worcestershire sauce, if you like. Transfer to a plate; wipe the pan with kitchen paper.
Divide the onions between 2 slices of the sourdough. Top with the mozzarella, Gruyère and the remaining thyme leaves; sandwich with the other 2 slices of bread. Melt the remaining 30g butter in the pan over a medium heat, add the sandwiches; cover and cook for 3-4 mins. Flip and cook for 3 mins more.

Tip: The onions take a while to caramelise – double up and freeze for future use, or swap for 200g Tesco Finest red onion chutney.

Freezing and defrosting guidelines

Freeze caramelised onions only. In order to enjoy optimum flavour and quality, frozen items are best used within 3 months of their freezing date. For more tips on freezing and defrosting food, read our article Love Your Freezer.

See more Ultimate sandwich recipes