Remove husks from tomatillos; wash thoroughly, and thinly slice.
Coat a cold cooking grate with cooking spray; place on grill over medium-high heat (350 to 400).
Place tomatillos on cooking grate, and grill, covered with grill lid, 4 minutes on each side or until tender.
Remove from grill; coarsely chop.
Toss onion with 1 tsp. olive oil. Grill onion in a grill wok or metal basket, covered with grill lid, over medium-high heat (350 to 40
minutes or until slightly charred, stirring occasionally.
Remove from grill, and coarsely chop.
Cut okra in half lengthwise, and toss with remaining 1 tsp. oil. Grill okra in a grill wok or metal basket, covered with grill lid, over medium-high heat (350 to 40
minutes or until tender, stirring occasionally.
Remove from grill.
Stir together lime rind and next 6 ingredients in a large bowl; add tomatillos, onion, and okra, tossing to coat.