Use a lightly - greased sharp chef's knife to slice bars. (e2bakesbrooklyn.com)
The easiest way to slice most vegetables thinly and consistently is to use a mandolin, however pepper fillets are best done by hand using a good sharp chef's knife. (yummyplants.com)
(An electric slicer is ideal for this but it can be done with a very sharp chef's knife.) (fieryfoodscentral.com)