I have a recipe that calls for toasted chopped pistachios. I'm wondering if I should toast them whole and then chop them up, or toast them chopped?
Toast the nuts evenly first, it will let off the steam in the nut. Then chop them. If they are evenly toasted the toasty flavor & crunch will be present throughout the nut. You will notice the difference in the nut as you eat it. :) I learned this from Christopher Kimball on America's Test Kitchen.