Prepare the Fat: Cut the fat into small pieces, about 1-2 inch portions.
Blanching: Pour the fat into a pot and add water, green onion, ginger, and cooking wine. Blanch the mixture for 1-2 minutes. This step is crucial for making the lard clear and bright, and it enhances the flavor of the rendered lard.
Straining: Remove the pork fat from the pot; it will be very clean and does not need washing.
Rendering: Return the fat to the pot, add a cup of water, and cook over medium-high heat until the liquid evaporates and the oil begins to render.
Cooking Down: Reduce the heat to low, stirring occasionally, and continue cooking until the fat is fully rendered and dry.
Straining Again: Scoop out the oil, press the remaining fat to extract more oil, and cook until done.
Using the Crispy Bits: Don't waste the crispy bits; season with salt and use as a side dish or in dumplings.
Storage: Store the lard in the refrigerator until solidified. It can be kept in the fridge or freezer for up to a year, or at room temperature for 4-6 months.