* 2 tablespoons groundnut oil
* 2 celery stalks, chopped
* 1 medium onion, chopped
* 100g (4 oz) ham, cubed
* 250 ml (8 fl oz) chicken stock
* 1 teaspoon cornflour
* 2 tablespoons water
* 3 spring onions, chopped on the diagonal
* 1 beaten egg

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