Champola de Guanabana

1½ lbs. guanabana (soursop) fresh or canned
3 cups cold milk
½ cup sugar (or to taste)

If using fresh fruit peel, seed, and cut the fruit into chunks. Puree in blender using some of the milk. Press through a colander to eliminate any fibers. Return to blender and blend with the rest of the ingredients. You may add more milk if you want it thinner. Serve cold over crushed ice.