I agree with you on the olive oil/grapefruit drink Tamas - I quite liked it too. But I had a thought - there are so many people who object to the taste, I wonder if some kinds of olive oil aren't more palatable than others. Some olive oils smell much stronger than others and I'm sure the same goes with taste.
And about the P&B that has been left for 15 minutes - wouldn't it be quite thick by then?? I'm going to try it to see - (I admit that the one time I did make the mixture and let it sit, I only used about a half cup of water and it was like jello).