Start by preparing the filling. Using a food processor or large knife, combine the peeled and salted freshwater shrimp (hipon), grated young coconut meat (buko), chopped onions (sibuyas), grated ginger (luya), garlic (bawang), and chilies (siling labuyo) until the mixture resembles cornmeal texture (parang giniling). Keep this mixture at room temperature while preparing the leaves.
Carefully inspect fresh taro leaves (dahon ng gabi) to ensure they have no holes or spots, as these can cause leaks during cooking. Lay out overlapping taro leaves in your work area. Place approximately 3 tablespoons of the prepared filling mixture in the center of the leaves. Wrap the leaves carefully around the filling, making sure to seal the edges well, and tie securely with kitchen string (pisi) or use the taro leaf stalks as natural ties.
Before cooking, prepare your pot by lining the bottom with smashed lemongrass stalks (tanglad). Arrange the wrapped Pinangat packets carefully in the pot, then pour in 3-4 cups of pure coconut milk (gata) until the packets are mostly covered. Bring to a gentle simmer over low heat (160°F/71°C), cover the pot, and cook for 45-60 minutes, occasionally shaking the pot gently to prevent sticking. The Pinangat is done when the leaves are soft and most of the coconut milk has been absorbed.
While the Pinangat is cooking, prepare the sauce. In a separate pan over medium-low heat (175°F/79°C), combine 2 cups of thick coconut cream (kakang gata) with finely chopped garlic, shallots (sibuyas tagalog), and sliced lemongrass. Simmer until the sauce becomes thick and creamy, then season with salt (asin) to taste. Just before removing from heat, stir in finely chopped spring onions (dahon ng sibuyas).
Serve the Pinangat hot with steamed white rice (kanin), generously spooning the prepared sauce over each portion. The dish can be stored in an airtight container in the refrigerator for up to 3 days, or frozen for up to 1 month. When reheating, steam for 10-15 minutes or microwave with a damp cloth cover. Remember not to reheat more than once for food safety.