Puree the raspberries and pass through a sieve. (You should have about 200ml). Pour into a small saucepan, add the sugar and bring to the boil, stirring until the sugar dissolves. Turn the heat down and simmer gently for about 10 minutes, until it forms a jam-like consistency. Set aside to cool.

Preheat the oven to 200C.

Beat the egg whites with the salt, gradually adding the extra sugar until shiny, stiff peaks form. With the beaters still running, spoon in a few tablespoons of raspberry mixture. Stop beating and gently fold through 2-3 more tablespoons of raspberry - it should just color the egg whites and give a delicate raspberry flavor. Taste the meringue and add more if you think the flavor is too subtle.

Grease six individual souffle moulds (10cm x 7cm deep) with butter and dust with icing sugar, tipping out the excess. Carefully spoon the souffle mixture into the moulds. Bake for about 8 minutes, then turn the heat down to 180C and bake for a further 3-5 minutes, or until the souffles have risen well above the rim of the moulds and are lightly browned on top.

Serve immediately with fresh raspberries.

Tip: Use the leftover raspberry jam from the raspberry souffle recipe on your toast.