Ka’b bin Malik (radi Allahu anhu) reported: “I saw the Messenger of Allah (sal Allahu alaihi wa sallam) licking his three fingers after eating.” [Sahih Muslim, #5296]
Thus, the best way of eating is that shown by the Messenger of Allah (sal Allahu alaihi wa sallam) which was eating with his three fingers.
Here is also the affirmation of licking one’s fingers after finishing a meal, and not during it. Another hadith encouraging licking one’s fingers states: “You do not know in which portion the blessing lies.” [Sahih Muslim, #5300] Therefore, to obtain the full benefit from the meal we should lick our fingers after the last morsel.
Also when eating, it if from the Sunnah to eat with the right hand for the Prophet (peace be upon him) said: “If one of you eats, he should eat with his right hand. And if he drinks something, he should drink with his right hand. For indeed, Satan eats and drinks with his left hand.” [Sahîh Muslim (2020)]