INGREDIENTS
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5 to 6 pounds point-cut beef brisket
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Kosher salt and freshly ground pepper
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3 to 4 tablespoons all-purpose flour
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2 tablespoons extra-virgin olive oil
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5 large Spanish onions, cut into thin wedges
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8 cloves garlic, smashed
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3/4 cup tomato paste
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3 cups (1 bottle) full-bodied red wine
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1 teaspoon sugar
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4 leafy inner stalks celery
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2 6-to-8-inch sprigs fresh rosemary
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2 bay leaves
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1 pound carrots, halved crosswise
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1 clove garlic, smashed
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Kosher salt
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1 6-ounce piece fresh horseradish, peeled
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1/2 cup roughly chopped fresh parsley
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2 to 3 tablespoons dijon mustard