Use whatever color peppers you like in this recipe. I like to use green, which is more traditional, but you can use a mix of red and orange for a sweeter flavor. You can even use sweet mini peppers. You can buy toasted pine nuts or use raw pine nuts and toast them. It helps to toast the pine nuts first in the pot you’ll use for cooking the ground beef. This minimizes the pots you’ll use and lends a nutty flavor from the pine nuts to the ground beef.