Sift together the corn starch and cocoa powder and set aside.
In a medium saucepan, combine evaporated cane juice, sea salt and 1-1/2 cups milk. Bring to a simmer over medium heat, stirring often.
Whisk the remaining 1/2 cup milk into the corn starch mixture until smooth.
Slowly whisk the corn starch mixture into the hot milk mixture. Whisk continuously over medium heat until thickened, about 5 – 7 minutes.
Remove from heat and stir in vanilla and banana puree. Pour into serving dish(es), cover with plastic wrap touching the surface and chill until set, about 1 hour.
Makes five 1/2-cup servings.