Miso Tahini Croquettes

Last night I wanted to make the root vegetables topped with Miso Tahini Nut Paste (http://justbento.com/handbook/johbisai/miso-tahini-and-nut-paste), but all I had were baby carrots. I decided to cut the carrots into small pieces, boil them, and mix them with the paste. I then put dollops of this into a mini muffin tin and baked them. They taste good, but they don't hold together very well. How might I refine this croquette variation on the original recipe?