Spray cold grill cooking grate with cooking spray; place grate on grill over high heat (400° to 500°).
Place tomatillos and next 3 ingredients on cooking grate; grill, covered with grill lid, 10 to 15 minutes or until tomatillos look charred, turning often.
Remove tomatillos and jalapeño pepper.
Grill tomatoes and onion 5 more minutes or until tomatoes look charred and blistered and onion is tender, turning often.
Cool 10 minutes.
Slice jalapeño; discard seeds, if desired.
Combine jalapeño slices, tomatillo, tomatoes, and onion.
Process grilled tomatillo mixture, cilantro leaves, and next 5 ingredients in a food processor 10 seconds or until mixture is coarsely chopped, stopping to scrape down sides.