My older brother (when kid) had this habit, after eating his half fried egg he use to lift up his plate with both hands and lick the leftover yolk. in way that plat is is facing his face, like in front of him.
We grew up ---long forgotten.
One day me my sister and elder brother's(same brother) 4-5 son were having breakfast on the table.
So now kid finishes his half fried eggs , lol lifts up his plates with both hands and lick the yolk off the plate.
Me and sister looked at each other and smiled in our eyes. (I miss my family :()