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Grind spices roughly in a spice grinder or bash with a rolling pin to crush.
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Mix fennel, coriander and pepper in a small bowl.
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Sprinkle some salt over the underside of the brisket, flip it so that the fat side is up.
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Sprinkle the crushed spices evenly over the fatty side of the meat, season with remaining salt.
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Place the brisket into a roasting pan with a rack. Cover the top of the pan with foil and then with it's lid if it has one.
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Place into a 300 ° oven, or barbecue over indirect heat.
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Bake for 4 hours, then lift the foil and spread onions in the bottom of the pan. Replace foil and lid and continue to cook for another hour.
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Remove the brisket from the pan and cover with foil lightly to rest.
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Carve across the natural grain of the meat.