We have all read this topic (which I can't find a consistent thread for - move this comment to it if you know it) over the years and thrashed it to death with opinions and possible explanations and some people have claimed to have come close.. and so I throw my hat into that ring with an observation from earlier this evening that immediately reminded me of this subject!
I have enjoyed many days out over the years and when it came to early evening, the aromas coming from 'Takeaways' and restaurants firing up ready for the evening trade have always made my mouth water, even if I couldn't immediately distinguish one style from another.
Earlier this evening, I was making my favourite from curryhell, which is the only recipe I have come across that uses a particular ingredient... during the final cooking process I used the opportunity to take some rubbish(refuse) out to the bin(garbage) and being a particularly warm, pleasant and clear night, I spent a few minutes staring up at the stars.
And so returning to my opening point, as some have discovered, we suffer from sensor overload whilst over the pan and curries have 'tasted' better the day after and food prepared by someone else always tastes better...
So maybe the missing 5% is all of that, being cooked by someone else, no sensory overload and a particular ingredient we associate with our favourite restaurant (I am sure they all tried to be unique and used more/less of some ingredients, 2 I remember well, 1 used way too much salt, the other too much ginger, yet some people liked them enough that one is still going strong 40 years later).
Add in a smatter of fondness of memory and all the vagaries that brings and I wonder.. was there ever a 5% or just some smell we associated with our favourite restaurant/dish/end of the night out?
Slightly off topic but when I used to go abroad, I could never get a 'proper' cup of tea until I was back in England. So if you never had BIR, trying to explain it and the taste of it, even if perfect might be impossible and not as palatable as your currently much improved takeaways or best home efforts to reproduce have rewarded you with.
Conclusion. The missing 5% does not exist, it is subjective.