Midrash for Chullin 99:6

מקמצין

accords with the statement of R'Awia in the name of R'Ammi who said: One must scrape away a little from the surface [of the fat upon the lesser curvature].<span class="x" onmousemove="('comment',' Only the surface of this fat is forbidden as it has been in close proximity to the fat that covers the inwards, which is forbidden. The rest of this fat, however, is allowed to be eaten according to the Palestinian view, and R. Ammi was a Palestinian.');">⁵</span>

Sifrei Devarim