I have about 40lbs of Texas Sweets I need to dehydrate. Just received my Excalibur (9 tray w timer) and the onions will be my first 'victim'. What's the best way? Dice? If so how big? Sliced? If so, how thin? Do I blanch, salt or lemon juice them before I put them on the trays? Or do I just slice and dry? Thank you so much.