I have a bit of a problem with couli's, I'm not keen on fluffy names for ordinary foodstuffs so I originally called this plain old raspberry sauce - Sam gave me a good talking to about what makes a sauce so couli it is...against my better judgement.
300g fresh raspberries
2 tbspns lemon juice
75-100g icing sugar - depending how sweet you like it
Put all ingredients into a food processor and blitz until smooth
Pour into a fine sieve and press through to get rid of all the pips
Pour into a bottle and pop into the fridge.