These days, every supermarket, country store, and corner deli seems to have a ready supply of top-flight bagels, as do shops that are devoted exclusively to bagels, their accompanying spreads, and bagel sandwiches with all sorts of interesting fillings. So, with all kinds of good bagels available just about wherever you turn, why make your own? First, so you know what's in 'em; who wants azodicarbonide in their pumpernickel bagel? Second, so you can customize them to your taste, as in pesto bagels with sun-dried tomatoes and pine nuts; and third, it's easy and fun If you can make bread dough, you can easily make bagels. These are a great treat to make with the young baker in your life.