To prepare Egg Foo Young omelet, lightly beat eggs. Mix 1 tsp cornstarch with 2 tsp water until smooth. Add to the eggs. Whisk thoroughly.
Add julienned (finely sliced) vegetables, leftover beef, garlic, sugar, oil, salt and pepper. Stir to combine.
Heat a frying pan with a little bit of oil in it. Add 1/4 of the mixture to the pan. Fry on medium heat for 2-3 minutes or until slightly brown. Turn the pattie and fry on the other side.
Egg Foo Young GRAVY: In a smaller saucepan, mix broth with cornstarch until smooth. Add remaining ingredients. Bring to boil, stirring continually, and cook for about 1 minute or until mixture thickens.
Serve warm Beef Egg Foo Young patties with sauce and sprinkled with green onions.