These charms date from the 15th and 16th century. Apparently, apples have always held a certain je ne sais quoi where love is concerned. It's hard not to think of Eve offering the apple to Adam as the earliest example of this sort of thing...

"Write on an apple, Guel + Bsatirell + Gliaell +, and give it her to eat."

"Write on an apple, Raguell, Lucifer, Sathanus, and say, I conjure thee apples by these three names written on thee, that whosoever shall eat thee may burn in my love."

"Write on an apple before it fall from the tree, Aleo + Deleo + Delato +, and say, I conjure thee apple by these three names which are written on thee, that what woman or virgin toucheth and tasteth thee, may love me and burn in my love as fire melteth wax."

"Write on an apple your names and these three names, Cosmer + Synady + Heupide, and give it to eat to any man that thou woulst have and he shall do as thou wilt."

"Cutt an apple in IV parts, and on every part write, Sathiel + Sathiel + Obing + Siagestard, and say, I conjure thee apple by the Holy God, by the IV Evangelists and gospels, and by Samuel and by Mary, that thou shall not stand still until I have the love of the woman which shall eat of thee."