Place the balls on oiled or banana leaf in a stacked steamer, leaving 1/2 inch between each. Steam over fast boiling water until the tapioca is quite clear, about 20 minutes. Remove the steamer from the heat and leave for 5 minutes for the balls to dry slightly before transferring to a serving dish. Sprinkle with crushed fried garlic or crushed roasted peanuts and garnish with chili slices.