Slice beef into shreds
Marinate the beef with ½ tsp sugar, ½ tsp light soy sauce, ½ tsp corn starch, 1 tsp curry powder and 1 tbsp water
Mix well with your hands. Squeeze the beef slightly while mixing so that the beef absorbs the marinade and water
Add 1 tsp oil and mix again the oil will lock-in the marinade
Slice ½ a medium-sized onion into shreds
Prepare 1 tbsp chopped garlic
Prepare slurry by combining ½ tsp corn starch and 1 tbsp water. Cut green onions. Set aside
Slice pineapple buns
In a wok or frying pan, add 1 tbsp oil on medium-high heat, add beef. Stir-fry for 2 minutes or until 50% done
Remove beef and add onions. Cook onions for 1 minute
Add 1 tbsp Sha Cha sauce, 1 tbsp garlic and 1 tsp oyster sauce to the onions
Stir-fry and mix well
Add beef back into the wok or pan. Stir fry and mix well
Taste test. Add soy sauce and/or sugar to adjust. Some Sha Cha sauce are saltier and sweeter than others. Stir the slurry and pour it in slowly. Stir until thickened Add more water if you would like it saucier
Add green onions. Turn off heat
Pile onto pineapple buns and serve