"Sadly, I cannot find fresh Anaheim or poblano chiles where I live (a travesty, I know) so I've only made this sauce with canned chiles. The canned variety usually have added sodium so that's why I rinse them prior to using. I can only imagine how fresh and delicious this will taste with roasted fresh chiles. To roast them, the chiles can be placed on top of a low flame on a gas stovetop and rotated until they are blackened all over. Let them cool slightly in a covered bowl before sliding off the skins and using in the recipe (alternately, the chiles can be broiled in the oven until the skins are bubbly and blackened)...."