Combine the coconut with 2 cups very hot water in a blender. Pulse on and off quickly, then turn on the blender and let it work for 15 seconds or so; take care that the top of the blender stays in place. Let sit for a few minutes.
Pour the mixture through a fine-mesh strainer into a bowl, pressing to extract as much of the liquid as possible. Discard the solids. Use the milk right away. Or store, covered, in the refrigerator for up to a few days.