Fraldinha

Fraldinha is a butcher's cut that the São Paulo churrasco scene turned into a star. The muscle is sold internationally with confusingly different names — sirloin flap or flap meat in the US, bavette in France, often mistaken for true flank — and it sat unloved in Brazilian markets until the 1970s. By widely-told accounts, steakhouse owner Marcos Bassi began featuring it after a French customer asked for 'bavette,' and the diminutive name 'fraldinha' (little diaper, for its thin, draping shape) was popularized through São Paulo's restaurant culture, sometimes credited to television director José 'Boni' Bonifácio. Regional Brazilian naming stayed muddled — in Rio Grande do Sul the gaúcho 'vazio' refers to what the rest of the country calls fraldinha — but the cut became a fixture of the rodízio churrascaria, grilled simply with coarse salt over coals.

The first bite reads loose and shaggy — long fibers you can see, pulling apart in juicy threads rather than a clean steak slice. There's real chew if it's cut wrong, but sliced thin against the grain it gives way easily, flooding with beef juice. The charred crust is salty and crisp; just beneath, a band of rendered fat seam and a thin silvery membrane add richness at the edges. You eat it medium-rare, draped over farofa to catch the drippings, brightened by spoonfuls of tomato-and-onion vinaigrette.

Fraldinha is a thin, flat abdominal muscle with long, coarse, parallel fibers — the grain runs the length of the cut. That structure is the whole story: cut along the fibers and each bite is a long unbroken strand that fights the teeth; carved at a right angle across the grain, the same fibers are shortened to soft, easily-severed segments. The loose grain and higher intramuscular fat (more than lean flank) trap juice and stay moist, so the cut rewards fast, high heat. Coarse salt drawn onto the surface pulls moisture out, dissolves, then partly reabsorbs as a brine that seasons deeper and drives a hard Maillard crust over hot coals; pulling the meat at medium-rare (about 52–55°C) keeps the long fibers from contracting and squeezing out their water. A rest lets the juices redistribute before slicing.