Place 4 tbls. flour in a large zip-type plastic bag. Place 1/4 of the meat in bag, shaking until meat is covered with flour. Remove meat to plate. Repeat with remaining meat,in batches, adding more flour if needed.
Heat oil in dutch oven or large skillet. Add half of meat and brown quickly; remove meat and set aside. Brown remaining meat; remove and set aside.
Pour off excess oil from pan.
Add sherry to pan- cook for 1 minute or so. Add onion, garlic, ginger and cook until softened and translucent. Add soy sauce and stock/water.
Return meat to pan and simmer, covered for 15 minutes, or until meat is tender.
Serve over rice noodles or rice - add pepper to taste and chopped green onions if desired.