Pressure Cook the Beef: Place the beef ribs and water in a pressure cooker. Cook for 25–30 minutes until the meat is fork-tender. You can transfer it to a larger pot afterward if needed.
Build the Flavor: Add the onions and tomatoes into the broth. Let it simmer for about 3 minutes.
Add Sourness: Stir in the sinigang mix and let it fully dissolve into the broth.
Add Root Veggies: Drop in the labanos (daikon radish), cover, and cook for 5 minutes.
Layer the Rest: Toss in the long green chili, okra, sitaw, eggplant, and kangkong stalks. Cover and simmer for another 5 minutes.
Season: Add patis and black pepper to taste.
Finish with Greens: Lastly, add the kangkong leaves. Turn off the heat, cover, and let the residual heat wilt the greens for about 5 minutes.
Serve Hot: Transfer to a large serving bowl. Pair with warm rice and enjoy!