"Nuair a fuair mo seanmháthair bás, adhlacadh mé í le úll. Fás an úll ina crann agus mar sin: itheann úll í."
"When my grandmother dies, I bury her with an apple. The apple grows into a tree and thus: an apple eats her."
A yew tree would be more traditional but it's perfectly possible ;)
"she eats an apple" and "she is eating an apple" are two different tenses in English, and itheann sí úll is the same tense as "she eats an apple", it's not the same tense as "she is eating an apple".