Add cream and vanilla extract. Just before adding to ice cream maker, stir a cup of ice cream mixture into peanut butter. Once mixed, stir into rest of ice cream mixture. Freeze in ice cream maker according to manufacturer's instructions. I used the odd mixture of chocolate because that's what I had available.
Many fruits are magical ice cream ingredients.
Strawberries and bananas seem to work particularly well. Ice cream made with these two fruits has a very nice texture. In this case, be sure to use very fatty cream or your ice cream may freeze improperly. Also, wait until the last minute before adding the juice to the cream, since the high acid content will curdle the cream. Simple recipe, great ice cream.