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Frozen Meat
Plenty of frozen Argentine beef and Irish/UK/NZ lamb in the Makro shops, outside of Brussels.
Personally I prefer the Irish beef, which they also sell.
Try Good Meat just off the Grand Place - by far the best place to buy frozen meat:
Colruyt - No idea about shops in Brussels or elsewhere, but the one in Waterloo has one of the most amazing variety and selection of frozen meats I've ever seen. Beef, Pork, Lamb, Rabbit, Venison, Chicken in a whole variety of cuts, as well as prepared barbecue selections, etc. etc.