وعن كعب بن مالك رضى الله عنه قال: رأيت رسول الله صلى الله عليه وسلم يأكل بثلاث أصابع ، فإذا فرغ لعقها.((رواه مسلم))
I saw Messenger of Allah (ﷺ) eating with three fingers (i.e., the thumb, the index finger and the middle finger) and licking them after having finished the food..
Grading by scholars
No per-hadith grading is listed in this dataset.