Sliced (extra mature cheddar). However at the moment I'm going through a bit of a croque monsieur fad which I like to do with emmenthal. I don't usually entertain pre sliced cheese in the house but Aldi and Lidl do a pre sliced pack of emmenthal for £1.69 which works out at about £4.50 per kg which is cheap for emmenthal so in that case I make an exception for pre sliced packs. Incidentally I also buy my extra mature cheddar (not pre sliced) from Aldi/Lidl as that is only about £4.50 per kg too. My cheese buying yardstick is £5 per kg. Anything below is cheap and anything above is expensive.