I have VKL vouchers and the Passporter book which has the operating hours of all the eateries at Disney.
Here's a list of the restaurants at Epcot that accept the VKL vouchers, and the hours they are open.
Biergarten ~ 11:35am - 3:45 pm, 4:00pm - 8:30pm.
The Garden Grill ~ Noon-3pm, 5pm-8pm
L'Originale Alfredo di Roma~ 12-4:15pm, 4:30-park closing
Le Cellier Steakhouse~ Noon-3pm, 4:30-park closing
Chefs de France~ Noon-3pm-5 pm-park closing
Nine Dragons~ 12-4:30 pm, 4:45- park closing
Restaurant Akershus~ Noon-4pm, 4:15 to park closing
Restaurant Marrakesh~11:30am-3:45pm, 4pm-park closing
Rose & Crown~ 11:30am-4:30pm, 4:30 pm-park closing
San Angel Inn~11:30am-4:00pm, 4:30- park closing
Teppanyaki Dining~12pm-3:45pm, 4:30-park closing
Being that the VKL's are for lunch, you should just disregard the second opening times of the restaurants.
You can see the menus of most Disney restaurants by going here-http://www.allearsnet.com/menu/menus.htm
HTH!