You can certainly use any 80/20 ground chuck in this recipe, but I urge you to try the Wagyu and see if you can taste the difference. There are lots of jalapeño pimento cheese spreads on the market, but if you want to make it from scratch, just use
my recipe here and add a couple of diced jalapeños. Look for the brioche buns (I find them at my local Rouse’s) or find a good substitute (I like the King’s Hawaiian brand). Don’t skip the step of toasting the buns at risk of soggy bread. Buy the creamy goat cheese not the aged, drier cheese.