There are people who come to Melita's to bulk up on Greek feta; others stock up on sumac, a lemony powder that the Greeks use on, well, just about everything. Still others pop in for the aptly named "Hercules" burger, five or six inches of heft favored by those whose only afternoon requirement is a really long nap. But it's hard to imagine that they wouldn't be just as happy with the Greek pizza, a sphere of chewy pita bread brushed with Greek olive oil and piled with salty feta, grilled onions, tomatoes and peppers, kalamata olives, shavings of well-seasoned gyro meat and, if you ask nicely, a dusting of sumac. This isn't your corner pizza, or your grandmother's pizza, or like any other pizza you've stuffed into your pie hole, and that's the whole point.