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.
Dictionary entry overview: What does persistent mean? â¢ PERSISTENT (adjective) The adjective PERSISTENT has 3 senses: 1. never-ceasing 2. continually recurring to the mind 3. retained; not shed Familiarity information: PERSISTENT used as an adjective is uncommon.