The butter not only adds richness to the burger and prevents it from drying out, but it also butters the bun for you. We're not going to downplay it, these burgers are decadent. But, if you're going to eat a burger, you may as well do it right. And, this recipe does it so right.
The word persistence means the quality of being determined to do or achieve something. It's tenacity. It means firmness of purpose. It is a continuing, repeating or lasting of something. Use the link and read a few similar definitions.
Use the verb persevere when you want to persist in anything and continue despite difficulties or obstacles. The verb persevere comes from the Latin root persevereus which means continue steadfastly, persist and that word comes from two others, per- for very and severus for strict.. So, today, the connotation of the word is to persist in a methodical way despite obstacles or distractions. You can see the relationship between persevere and perseverate, which means to persistently repeat something, and that word is a medical term used to describe stuttering. Definitions of persevere.