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Cut duck into quarters. Remove head, neck, backside and trim off fats of duck.
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Clean and wash duck with salt and vinegar and rinse with water.
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Place duck parts in a pot and pour water submerging parts.
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Blanch for a few minutes to remove scum and rinse off with running water.
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Wash, cut and soak kiam chye for 30 minutes. Change water at least twice.
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Add “Ingredients A” but only half of the tomatoes into the Instant Pot.
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Cover with the lid and twist clockwise to lock.
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Switch on the Instant Pot.
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Set pressure cooking time to 15 mins.
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Pressure will slowly build up until plunger fully pops up.
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Timer will count down from 15 mins to 0 min.
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Release pressure by pressing the quick release button.
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When plunger drops down fully, remove the lid by twisting anticlockwise to unlock.
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Add “Ingredients B” and remaining tomatoes.
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Cover Instant Pot with a glass lid and select “Sauté” mode at “Less” setting.
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Boil soup for 10 minutes..
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Before serving, switch off Instant Pot and transfer to a serving dish.