1. Put the sirloin in the pot, cook for 2 minutes, wash with clean water, cut tomatoes, onions, and potatoes into pieces for later use.
2. Cut the ginger and set aside.
3. Put oil in the pan, add the sirloin and ginger, add the dark soy sauce and stir-fry evenly.
4. Add light soy sauce and stir-fry evenly.
5. Put it in water and simmer for 40 minutes.
6. Fry potatoes and onions for 2 minutes and set aside.
7. Add tomatoes, onions, and potatoes and simmer for 20 minutes.
8. Season with salt. Just collect the juice over high heat.
9. Put it in a bowl and let it warm and use slowly.
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