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Preheat the oven to
180°C/350°F/Gas mark 4. Grease 4 moulds, measuring
300ml/10fl oz.
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In a pan, dissolve the caster sugar
in the water over a low heat. Warm the double cream
in another pan.
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When the sugar has dissolved, turn
up the heat under that pan and boil until golden
brown. Remove from the heat and add the hot cream,
stirring. Pour equally between the moulds.
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With an
electric whisk, cream the butter and muscovado sugar
until off-white and then whisk in the egg yolks, one
at a time.
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In a glass bowl, whisk the egg
whites to soft peaks and reserve.
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Sift the flour and
baking powder into a bowl, then whisk into the
butter cream. Then fold the egg whites into the
mixture.
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Spoon into the moulds and cover the tops
with buttered rounds of baking parchment.
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Put into a
roasting tin and pour hot water from the kettle to
come half-way up the moulds. Bake for 40 to 50
minutes.