They've made the leap from fast-food staple to stylish hors d'oeuvre. Sample the best gourmet two-ounce burgers at these upscale clubs and restaurants.

POP BURGER, New York: This mod lounge and burger window serves chunky, juicy patties on toasted brioche buns. $5 for two at the window, $12 for three in the lounge. 212-414-8686.

AURA, Portland, Ore.: Not a beef eater? No problem. This chic bar offers salmon, jerked-chicken and portobello burgers in addition to a spicy version of the classic. $9 for three. 503-597-2872.

MATCHBOX, Washington, D.C.: This three-story bistro is a great place to bring your kids. Its gourmet sliders, served on a one-ounce buttered brioche, come with crispy onion straws. $6, $9 or $12 for an order of three, six or nine. 202-289-4441.

LE CIRQUE 2000, New York: Made with shredded short ribs, caramelized onions and porcini mushrooms, and served with parsleyed potatoes, these are for the true gourmet. $24 for two. 212-303-7788.