Just take an appropriate quantity of narcotic drugs (On prescription or not, its fine...), Add alcohol liberally, Then 'gestate' until comatose.
After a time, reflex vomiting will occur. Vomit is the final ingredient for a Notting Hill Cocktail.
-To properly experience The Notting Hill Cocktail, the vomit must then be generously inhaled.
If done correctly, The Notting Hill Cocktail is the experience of a lifetime (-Its the last thing you'll ever do !) Cheers !