Mix the baking soda with water. Add it with the reset of the seasoning into the beef and mix it well. Marinade for at least 30 mins
Add 2 tsp of oil in the pan. Heat it with high heat. When the pan and hot is oil. Add in the beef and pan-fry until both side is golden. When it is about medium done, dish it up and put it aside.
Heat the pan with medium high heat. Add in 1 tsp of oil. Add in the onion, shallots, and garlic. Stir fry them until fragrant. Add in tomato and mix it well
Once the onion is soft, add in the sauce mixture. Turn the heat to medium low. Simmer for 1-2 mins. Add in the beef and mix it well. Thicken the sauce mixture with starch mixture.
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Notes
Ingredients - Click to enlarge the imageOther tips1 You can replace the baking soda with any acidic fruit pure or yogurt. But the marinade time will need to increase to 3 hours2 You will need to do taste testing at the end to ensure the taste is what you like.