method
1. Use a little of the margarine to grease a deep souffle dish, 6 inches (15 cm) in diameter.
2. Melt the remaining margarine in a 2-pint (1 litre 200 ml) saucepan, add the onion and stir-fry for 2 - 3 minutes.
3. Add the mushrooms and stir-fry for a further 2 minutes.
4. Sprinkle the flour into the saucepan and cook over a low heat for 1 - 2 minutes, stirring all the time.
5. Remove from the heat and gradually blend in the milk.
6. Bring to the boil, stirring continuously, and boil for 1 - 2 minutes.
7. Allow to cool a little.
8. Beat the egg yolks and cheese into the sauce. Season to taste with mustard, salt and pepper.
9. Whisk the egg whites with a pinch of cream of tartar until peaking.
10. Using a tablespoon, lightly fold them into the mushroom and cheese sauce.
11. Transfer the mixture to the souffle dish and bake at Gas Mark 4,180°C, 350°F for 35 minutes until golden brown, well risen and just set.
12. Serve immediately.
serving amount
serves 2
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