Having worked in the restaurant industry for many years I can tell you that they best way I have found to pound out a breast is...
Place the breast between 2 pieces of saran wrap, if using a meat mallet use the smooth side if it has one, you're not trying to tenderize the breast just flatten it. Work from the center out in a circular pattern lightly pounding/pushing outward with each whack , if you pound on the same area of the breast over and over it will flatten but you are more likely to damage the breast creating a tear in the meat.
Oh, I also never have used oil or water to flatten the breast and it has always worked well with the moisture in the breast, but if anything I think a little water couldn't hurt, though I wouldn't recommend oil as it will become such a hassle to keep the saran wrap in position once the oil spreads.
Hope this helps.
Place the breast between 2 pieces of saran wrap, if using a meat mallet use the smooth side if it has one, you're not trying to tenderize the breast just flatten it. Work from the center out in a circular pattern lightly pounding/pushing outward with each whack , if you pound on the same area of the breast over and over it will flatten but you are more likely to damage the breast creating a tear in the meat.
Oh, I also never have used oil or water to flatten the breast and it has always worked well with the moisture in the breast, but if anything I think a little water couldn't hurt, though I wouldn't recommend oil as it will become such a hassle to keep the saran wrap in position once the oil spreads.
Hope this helps.