They were already roasted in the oven, then I pureed them. You can roast your own, or use jar/canned. I use canned, because I found a brand that makes a big can of them for a decent price. I just make a personal size pizza (my fiance and I each make our own so we can each have our own topping). I probably used about 2 whole peppers or so. I used one clove of garlic. No oil. This is something really flexible, because if you make too much sauce, you can just save some for next time! I pureed mine in a mini-prep food processor thingy. I don't have a real food processor yet - going to add that to my registry! But, blender should work just fine. And I used dried basil, because we didn't have any fresh, and chopped up about 3-4 black olives, and just sprinkled them on.