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1
Grind allspice, peppercorns, and salt to a coarse powder. Stir in vinegar and water to make a paste.
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2
Rub paste thoroughly over steaks. Marinate at room temperature for at least 1 hour.
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3
Heat lard or oil in a heavy, wide pot over medium heat. Cook onion until translucent, then push aside. Raise heat slightly and sear steaks on both sides — work in batches if needed to avoid crowding.
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4
Layer all steaks back into the pot. Arrange potato slices and onion over the top. Pour any remaining marinade and pan juices over everything. Lay parsley stems across the top.
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5
Cover tightly. Reduce heat to very low — around 90–100°C / 194–212°F. Cook for approximately 1 hour 15 minutes, lifting the lid occasionally to baste the top layer with the juices that collect at the bottom.
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6
Rest briefly off heat before serving. Spoon braising juices over each portion.