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1
Season brisket all over with ground pepper and 1/4 cup Diamond Crystal or 2 tablespoons plus 2 teaspoons Morton salt, rubbing into the grain. Wrap tightly in plastic and chill at least 3 hours and up to 3 days.
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2
Place a rack in lower third of oven; preheat to 275u00b0F. Heat schmaltz in a large roasting pan set over 2 burners on high. Unwrap brisket; cook, reducing heat if needed, until browned, 7-10 minutes per side. Transfer to a baking sheet.
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3
Reduce heat to medium-high. Add onions, carrots, and celery to pan; season with salt. Cook, stirring occasionally, until browned and just softened, 15-18 minutes. Add wine, bring to a boil, and cook until evaporated, 8-10 minutes. Add garlic, thyme, bay leaves, peppercorns, and broth; bring to a boil. Nestle brisket into aromatics and cover tightly with foil; braise in oven until meat is very tender but still holds its shape, 2-3 hours. Let cool, then chill at least 8 hours and up to 2 days.
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4
Preheat oven to 250u00b0F. Remove solidified fat from surface of braising liquid; discard. Transfer brisket to a platter. Strain braising liquid into a large measuring glass; discard solids. Return liquid to pan and cook over medium-high heat, stirring occasionally, until reduced by half, velvety and intensely flavored, but not overly salty, about 30 minutes.
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5
Return brisket to pan, cover with foil, and heat in oven until warmed through, 60-90 minutes. Transfer to a cutting board and slice against the grain. Arrange on platter and pour braising liquid over.
