Necessity as Mother of Invention
As a born & raised kid from Brooklyn (a very different animal from the imported varieties), hearing can't be done is almost a challenge (good-natured, of course) to prove it can (ah, that is truly the joy of cooking for me!). My experiences in traveling have shown you can travel with food products pre-packaged in certain ways and depending on the originating and destination countries.
>> For jerk spice I'll just need to find a decent London spice shop if I go with scratch. Generally including allspice berries, whole nutmeg, cinnamon, black peppercorns, dried thyme, cayenne or paprika, sugar, salt & fresh garlic & ginger I don't think these are too exotic (especially given the stuff they sell at Fortnum & Mason) or at least packaged here. Better yet, if I find a really good bottled brand toss the unopened, sealed bottle into the checked suitcase (never hand luggage).
>> Key Lime Pie - not so much a purist here as long as it works. My research so far indicates the standard recipe is three ingredients Sweetened condensed milk, egg yolks & key lime juice and that during mixing, a reaction between the condensed milk and the acidic lime juice occurs which causes the filling to thicken on its own without requiring baking. Baking is only a recent addition to guard against salmonella. Williams-Sonoma has a recipe on-line which works on a double boiler basis which I will co-opt to this end. Don't know if condensed milk is a staple in England. Does anyone else? If not, into suitcase it goes or adopt the fresh cream Williams-Sonoma approach. Finally, key lime juice may be the Achilles heel here. Again my research shows liquor stores sometimes carry Rose's lime juice (another suitcase candidate) which IS sweetened key lime juice. Depending on the sugar content, again, could switch out condensed milk for fresh as per Williams-Sonoma. Another possible sub I found was 1/2 Persian lime juice and 1/2 lemon juice. If the original point of using key limes is the higher acidity to "cook"/set the eggs & condensed milk, in my double boiler approach I just need to approximate the pucker taste which makes the regular lime/lemon option reasonable. I think I'm going to make a lot of people happy in the next few weeks as I dry run these approaches to "boil it down" to the the simplest copycat. BTW - pun intended smileys/wink.gif
>> Tamarind/Plantain - Given the large Carribean population in London, I will check with my Jamaican friend who lived in London and has a sister there to identify one place where I might find both. Then again, tamarind can be bought packaged as a paste here in NY so worse comes to worse chuck into said bag.