First, let’s prepare the oxtail, clean under running water and place in a deep cooking pot.
Cover with enough water and apply medium heat then bring to a boil. Remove the scum that rises.
Lower the heat and add more water. Make sure to maintain about 6 cups of water as we will use the broth later.
Cover and simmer for about 2 hours or until the oxtails can be pierced by a fork. (See cooking tips above for a quicker cooking time)
Drain the oxtail and reserve 6 cups of the broth then set aside.
Next, we prepare the vegetables. In a cooking pot, bring about 4 cups of water to a boil.
Blanch the banana heart for 1 minute then remove and set aside.
Blanch the eggplant for 1 minute then remove and set aside.
Blanch the string beans for 1 minute then remove and set aside.
Blanch the pechay/ bok choy for 30 seconds then remove and set aside.
Place the rice flour in a skillet or frying pan and apply medium heat.
Cook the rice flour, while stirring occasionally, until lightly browned and toasted.
Combine the toasted rice flour and 1/4 cup of the reserved broth in a bowl then whisk until smooth.
In a small bowl, combine the annatto powder with another 1/4 cup of the reserved broth then stir until dissolved.
In another bowl, combine the peanut butter with 1/2 cup of the reserved broth then stir until well blended.
Pour the cooking oil in a large cooking pot and apply medium heat. When the oil is hot enough, add-in the onion and garlic then cook until soft and aromatic.
Add-in the oxtail. Cook and stir occasionally until lightly browned.
Add-in the patis then cook for about 2 to 3 minutes.
Add-in the remaining 5 cups of the reserved broth and bring to a simmer.
Add-in the rice flour mixture, the annatto powder mixture, and the peanut butter mixture and stir well to combine.
Season with salt and pepper to taste.
Continue to cook for 10 minutes or until the sauce slightly thickens.
Add-in the blanched vegetables and cook for another 2 to 3 minutes.
Remove from heat and transfer to a serving bowl with shrimp paste on the side. Enjoy!