Combine first 8 ingredients. Divide the mixture into 6 equal portions, shaping each into a 1/2-inch-thick patty.
Place patties on a grill rack coated with cooking spray; grill 6 minutes on each side or until a thermometer registers 160°. Remove from grill; let patties stand 5 minutes.
Place buns, cut sides down, on grill rack; grill 1 minute or until toasted. Place 1 patty on bottom half of each bun; top each serving with 1 lettuce leaf, 1 tablespoon radishes, and top half of bun.
Beer note: With their gingery Asian spice, these burgers call for a classic brown ale like Samuel Smith Nut Brown Ale ($10 for four 12-ounce bottles). With a moderate five percent alcohol and a nicely rounded taste, this beer's toasted nut flavor complements the burgers' nutty sesame oil essence. Darker beers are also a great match with the crisp snap of radishes. --Jeffery Lindenmuth