The Redland Fruit & Spice park has samples of ripe fruit available on a daily basis and I was fortunate enough to be able to taste a ripe HM about two weeks ago. There is no doubt that it would be great for tostones as it is quite meaty. It was also good to eat out of hand. I planted one a few months ago and am looking forward to the harvest. Another good banana for tostones is the not so meaty but firm Macaboo.
