don't know if they'll grow like that, lj, they don't have an 'up' side, like potatoes, as long as you get slips, it should be okay..I've just copied from a magazine article i read, the cut side is just in the water, caseylee ..hope this helps, don't forget, i'm just experimenting as well, only got 1 slip last year but started them too early and it got frosted :)
if you click on the pics, they should go bigger, you can just see the slips growing..leaf like things ;D