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Coarsely chop fermented black beans. Combine with garlic and set aside.
In a 1-cup measuring cup combine chicken stock, sherry, soy sauce, sesame oil, sugar and pepper.
SAUCE
In a small bowl whisk cornstarch with 1 tablespoon water. Set aside.
Place 2 tablespoon butter in a 10-inch skillet set over medium-high heat.
When butter sizzles add black beans and garlic. Sauté just until the garlic sizzles.
Add sauce and bring to a low boil.
Add cornstarch mixture and immediately stir sauce until thickened. (For a thinner sauce add only half of the cornstarch mixture.)
Remove from heat and stir in 1 tablespoon butter.
Arrange asparagus in serving dish. Pour on sauce and sprinkle with sesame seeds. Serve hot.