Like making Russian dumplings with your Russian friends. Or schnitzels and glü wine with the Germans. There was the mighty Australia v Britain Mite-Off between Vegemite and Marmite, and the big Spanish lunches complete with sobremesa. You can borrow saucepans, spatulas, butter, pasta, spices... You can introduce each other to all sorts of delicious oddities, and never have to venture outside.
Now please excuse me, I have a curry waiting in No. 36.