1.Chop rashers into 5cm (2in) pieces with sharp knife or cleaver.
2.Cook pork pieces in hot oil until golden brown.
3.Soak washed black beans in a tablespoon of the water for 10 minutes, place in blender with remaining water, blend on high speed one minute, or mash beans well with the water. Combine soy sauce, ginger and crushed garlic, stir in black bean mixture. Place sauted rashers in pan, pour sauce over, bring to boil, reduce heat, simmer covered, one hour.
4.Combine cornflour, extra water and sherry, stir until smooth. Add to pan, stir until sauce boils and thickens, reduce heat, simmer one minute.
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