「Braised Crab in Soybean Paste」

所需食材：Crab (preferably river crab, or blue swimmer crab as alternative): 500 g (about 3-4 medium river crabs)、Broad bean paste (Doubanjiang): 30-50 g、Rock sugar (optional): 0-15 g、Dark soy sauce: 15 ml、Rapeseed oil (unrefined, or peanut oil as alternative): 20 ml…