In a large wok, bring peanut oil to high temperature. Dust the crab pieces with cornstarch and a little salt. Shallow fry the crab for only 1 to 2 minutes until the crab shells turn red. Drain on paper towels. Do the same with the 2 shells. Reserve oil and wipe wok clean. Add 2 tablespoons oil back to the wok on high heat. Stir-fry the beans, ginger, garlic and scallions for 1 minute until soft. Add back the crab and deglaze with shaoxing and add soy and stock. Check for seasoning and bring to a boil. Thicken with the slurry and cook 30 more seconds. Serve immediately with the cooked shells.
PLATING On a large oval, place the 2 shells down near both ends. Fill with hot rice. Mound the crab between the shells. Enjoy with your fingers. Can also serve with lemon finger bowls.
Wine suggestion: Marsanne, Bois du Renard, Languedoc 1998