From the Whole Foods Market Cookbook. I buy this at the deli at my local Whole Foods a lot, mostly because if I make it, I will eat it ALL. Much better to walk up to the counter and say "One small cup of the mozzarella and penne, please!" Sometimes I find that the deli combines roasted AND fresh bell peppers, a nice added texture, and I'm not sure that they don't blanch their spinach leaves very quickly, as theirs always seem slightly wilted, although it doesn't call for that here. When I make this, my husband prefers that I use some regular mozzarella along with the smoked (just his personal taste) but I like the smoked. When cutting or grating fresh mozzarella, a useful tip is to pop it in the freezer for a few minutes to firm it up a bit--it will be much more receptive to the advances of your knife when it comes out!