Onion soup with Gruyère croûtons

Fruit and vegetables

1kg/2lb 4oz onions, finely sliced

Tins, packets and jars

1 tbsp plain flour

Cooking ingredients

salt and black pepper
1.2 litres/2 pints stock (ideally beef but chicken or vegetable would also be fine)

Dairy, eggs and chilled

50g/1¾oz butter
150g/5½oz Gruyère cheese, grated

Other

1 baguette, cut into 1cm/½in slices

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