I ban RedRoach because a great british carvery is essentially as follows:
You go to a pub (place that sells booze and often lunch and dinners.) Or specific carvery place (they exist.) You usually pay a set price per person for the meal, kid's are usually cheaper. Drinks are not included.
What happens is you are granted permission to 'go up' after being seated and ordering drinks. Which means you go up to a sort of counter and you choose what things you want, things from a a Great British 'roast dinner',
Which, in Britania as you call it means a
roasted meat, usually beef, lamb, pork, or chicken, Yorkshire pudding [a kind of batter that is cooked to leave a well in the centre to allow gravy to be placed, note sometimes this batter can be filled with sausages, but that is a whole other dish.]
Fig. 1. A Yorksire pudding- is excellent with gravy.
This is usually accompanied by roasted potatoes and other vegetables, note the best roasted potatoes are covered in goose fat before cooking.
You choose what you want when you 'go up', it is the norm to have lot's of one kind of meat or an assortment of different ones, in the interest of fairness if you choose an assortment of meat, the amount you get will be equal in size to the amount you would get if you only choose one sort of meat.
More often than not just after the 'counter' with the meat there is a table with sauces, like mustard and gravy etc. and most importantly sausages this table is help yourself which is a bad move for the restaurant as they suddenly lose out on sausages... for some reason
Also it should be noted that you cannot 'go up' more than once which sounds bad, but if you know this beforehand you will get lots of food so all is good. It is called a carvery because the meat you get is carved in front of you on request at the meat 'counter'.
And as for outside of the UK I'm not sure where you can get one, now you know what one is that might make finding a carvery or equivalent easier.
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