Brown spareribs in oil on high heat for 5 minutes. Drain excess fat. Mash black beans, garlic and ginger (in a mortar and pestle if you have one). Add to spareribs and cook 1/2 minute. Add soup stock, soy sauce, mirin, salt and sugar. Cover and simmer 15 to 20 minutes. There should be a small amount of liquid left. Add cornstarch mixture to thicken. Garnish with green onions.
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