This is why foodies rave about Restaurant Week in Las Vegas:  The city's top restaurants are serving three- and four-course meals for $20.10, $30.10 or $50.10.

At these prices, there's no reason to eat anywhere else this week, because there are 100 choices, and each meal ends with a donation to Three Square food bank in a recession hitting Las Vegas harder than anywhere else.

Most of the top restaurants (Joel Robuchon's at MGM Grand) are in the $50.10 range.

Here are some serving multi-course lunches for $20.10:

BLT Burger, Caesars Palace: Certified Angus Beef burger with madeira-soaked mushrooms, brie, applewood smoked bacon, truffle aioli; rosemary-garlic shoestring potatoes; soda; and a big, squishy S'MORE.

BOA Steakhouse, Forum Shops: Meal begins with organic baby greens -- one of few chefs offering organics this week -- and ends with chocolate-filled donut hotels with truffle sauce and vanilla creme anglaise.

Cafe Bellagio, The Bellagio:  Serves lunch from 11 a.m. to 3 p.m. for Restaurant Week. They're serving grilled chicken paillard with baby vegetable salad and a Creole mustard vinaigrette.  Banana cheesecake is so special it's the only dessert offered.

Cafe Bleu, Center Crossing Rd.: One of the few to offer lamb on the Restaurant Week menu, this spot is serving Merlot-braised lamb shank with mushroom ragout and cannellini, gazpacho soup with pecorino romano croutons, and more. How to resist the chocolate lava cake with fudge sauce and creme anglaise?

DW Bistro, Fort Apache Rd.:  A great summer menu includes jerk-seared ahi tuna, Jamaican chicken curry soup and a sliders duo (turkey burger and a New Mexican green chili cheeseburger), and jerk chicken with couscous salad.  Desserts include lemon-lime pudding.  (This is the only Restaurant Week participant we know serving kumquats -- they're in a marmalade and served with fresh mango with the ahi tuna.)

KGB (Kerry's Great Burgers), Harrah's:  Celebrity chef Kerry Simon offers veggie burgers or his meaty creations. Cotton candy makes a big finish.

Rao's, Caesars Palace:  Think big, think meat, as in meatballs made with beef, veal and pork; thin-crust pizzas; parma proscuitto calzones; spaghetti marinara. Linger over "torta di ricotta" (classic Italian cheesecake) or a tiramisu made with mascarpone, coffee and Irish Cream Charlotte.

Simon, Palms:  Kerry Simon's other home, when he's not on Food Network.  Look for lobster in several dishes.  Dessert first? Simon's serving warm, chocolate chip cookies.

Skybox Sports Bar & Grill, Aria (main casino floor): Crab cakes, buffalo sliders and a pound of chicken wings are choices here.  Beer or wine are $5.10.

Society Cafe, Wynn:  More lobster and charred rare tuna here, or go for pulled pork sliders, "sloppy Joseph" sliders, filet mignon sliders, turkey/applewood bacon/avocado club;  and for sweets, "warm donut bites" or fresh fruit.  This is the only spot offering organic turkey.

Studio Cafe, MGM Grand:  Lunch or breakfast at $20.10. A three-course breakfast starts with a fresh fruit smoothie or coffee, then a 14-oz., pork T-bone streak with two eggs, piquillo peppers and fingerling potato hash, and finishes with maple-glazed donuts and caramel dipping sauce.

Sushi Rocku, Forum Shops: Assorted sushi (6 kinds, including 3 kinds of tuna) with seaweed salad or hanabi; or a grilled petit filet with mashed potatoes or steamed rice, followed by mini chocolate cake or fresh fruit with sorbet.

Restaurant Week ends Sept. 5.

In this city of obvious wealth, there's a lot of less-apparent poverty.

Three Square is busier than ever, helping a quarter-million Las Vegans without enough to eat.  That includes 150,000 children.

Last year, the food bank helped people in the Valley with 10 million pounds of food -- double the amount available in 2008.

Learn more about the need in Las Vegas, and Three Square's many programs, at threesquare.org.

Full menus for each of 100 restaurants, with prices, are available there too.