In a large pot, brown beef in oil-make nice and brown, so there are bits on the bottom of the pan.
Add onion and water to pot-make water go about 2/3 of the way up pot.
Put lid on and simmer for about an hour.
Add carrots, simmer 1/2 hour.
Add potatoes, simmer until potatoes and carrots are tender, about 1/2 hour.
Turn up heat to a gentle boil. Mix cornstarch with 2 Tbsp of warm water. Add to stew, turn down heat and let thicken.
Mix dumpling ingredients and drop by tablespoons into simmering stew. Let cook about 10-15 minutes.