Poke is a traditional Cook Islands recipe for a classic dessert of cooked bananas mixed with milk, thickened with arrowroot, and sweetened with sugar that's baked and served in coconut milk. You can substitute the arrowroot with an equal amount of cornstarch. I recommend using a scale. 7oz cornstarch = about 1.5 cups. The purplish color is somewhat disturbing but the results are delicious! Posted for ZWT7.