Place the green bananas and plantains in water and bring to a boil. Boil until they are softened. Once softened, remove the skins and slice into chunks.
Peel the potato and cut up into cubes.
Peel the butternut squash, scoop out the seeds and slice 1 pound of cubes.
Peel the malanga, cutting off any parts that are browned. Cut into rough cubes.
Using a food processor and the grating attachment, grate the potato, squash, and malanga. You will need a large bowl to hold all of the grattings. It will appear you have way too much, but do not fret, this all shrinks down to a manageable amount.
Grate the bananas and plantains in the food processor. Then removew the bananas, place in the regular processor knife and process further.. This will be a bit sticky, so immediately immerse in water, or just immediately wash the slicer and bowl.
Take the grated vegetables and place them in batches in a foor processor. Process until you have a somewhat smooth mixture. Place this mixture into another bowl.
To the processed vegetable mixture, add the bananas, anchiote oil, broth, milk, adobo, salt and corn starch (see note). Mix very well by hand. This is the best way to make sure all the ingredients are well mixed and incorporated. Remove any large pieces, you can re process or discard.
Once well mixed, cover and set into the refrigerator. Some slight darkening will occur overnight, but just remix this your hands the next day, the color will be fine. It darkens on cooking anyway.