Warm barbecue/ grill on medium temperature. In a huge preparing dish, consolidate oil, garlic, chipotle, and salt. Add asparagus, shiitakes, and green onions; throw to cover. Flame broil asparagus until delicate and gently roasted, turning at times; 5 to 6 minutes. Barbecue shiitakes and green onions until softly scorched, turning infrequently; 4 to 5 minutes. Move vegetables to cutting board.