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(adapted from https://www.chinasichuanfood.com/kung-pao-sauce/)
Stir fry vegetables except chickpeas, reserve. Crush peppercorns and chilli in a mortar. Pre-mix the sauce ingredients except cornstarch. Fry peppercorns, chilli and ginger garlic paster for a few seconds, until fragrant. Mix in the soy sauce mixture, bring to boil. Thicken with cornstarch. Mix in vegetables and chickpeas. Serve over rice garnished with scallions and peanuts.