When I was in Buenos Aires in December, we stayed at the superb Four Seasons Hotel Buenos Aires, where, every Sunday, an excellent brunch featuring Argentine specialties along with more familiar fare is served in the historic Mansion restaurant behind the hotel. I was especially inspired by chef Juan Gaffuri's beet gravlax, which is silky, sweet and beautiful to look at. If you have aquavit on hand, use it instead of the vodka for a more Swedish taste.