1. Cut the tenderloin into pieces of uniform size with a cross knife, add one spoonful of salt and two spoonfuls of coarse sweet potato powder and grab well.
2. Cut the potatoes into pieces of the same size
3. Pour more oil into the pot and heat it to 90% heat.
4. Fry the meat piece by piece.
5. fry until brown, drain the oil and put it on a plate for later use.
6. The oil in the pot continues to stir-fry potato chips.
7. Drain the oil and dish it up for later use.
8. Crush 3 pieces of garlic to make garlic paste.
9. Pour the excess oil into another cup, leave a little oil in the pot and stir-fry the garlic.
10. Add 3 tablespoons of tomato sauce.
1 1. Add 3 tablespoons of water, 2 tablespoons of sugar and 1 tablespoon of salt and bring to a boil.
12. Put the meat and potatoes in the pot.
13. Stir fry quickly, sprinkle with chopped green onion and serve.