Grilled Asian Burgers with Onion and Pineapple

pound(s) uncooked 93% lean ground beef

cup(s) uncooked scallion(s) sliced

teriyaki sauce

ginger root freshly grated

minced garlic

slice(s) pineapple four 1/2-inch-thick rings

medium uncooked vidalia onion(s) cut into four 1/4-inch-thick rounds

spray(s) cooking spray

cup(s) cilantro fresh, chopped