found this on google and it's sooo good i just had to share 
 
 
200g raw feijoas
200g sugar
1 tablespoon lemon juice
1 egg white 
300ml cream
Blend all ingrediants except for the cream.  Beat for about 5 minutes until the mix resembles meringue.  Fold into whipped cream.  Freeze. (makes about a litre)
I have an icecream maker, so didn't bother whipping the cream - just mixed it in with the meringue-mix and threw it in the machine for 40 minutes and it turned out beautifully creamy!