Blowing raspberries whilst eating!!!

My little girl is as good as 6 months and she finally took to weaning at the end of last week (after around 5 weeks of trying!!). We have now entered a phase of constant raspberry blowing from her and today she decided that everytime the spoon touched her lips, she would blow a raspberry! She barerly got any of the puree in as she would just blow it straight back in (that's if the spoon managed to get passed her lips!!), when she did get it in, she seemed to enjoy it but then would go back to raspberry blowing! Help!!!!!!!!!!!!!!!