Haute Brazilian at Café Boulud — Limited Time Only!We’ve got nothing against your typical feijoada, the black-bean stew that’s Brazil’s national dish and often as dark and heavy as a neutron star. But though there are fine meals to be had in “Little Brazil” (which you can find on 45th and 46th Streets near Fifth Avenue), New Yorkers rarely get to taste the best of what the country has to offer. This week, as Rob and Robin point out in the magazine, top Brazilian chefs João Leme and Fred Frank have been cooking more nuanced, tropical-tinged dishes at Café Boulud. Their repetoire includes a high-end feijoada, which will be served, once the chefs leave at the end of the weekend, every Saturday this month. But we’d try some of their other dishes while there’s still time.