1. Prepare grill to medium-high heat.
2. Heat 2 teaspoons oil in a large nonstick skillet over medium-high heat. Add onion to pan; sauté 5 minutes. Reduce heat to medium-low; cook 5 minutes or until browned. Add asparagus to pan; cook 5 minutes or until asparagus is crisp-tender. Stir in tomatoes and salt.
3. Roll dough into a 12-inch circle on a lightly floured surface; brush each side of dough with 1/2 teaspoon remaining oil.
4. Place dough on a grill rack; grill 1 1/2 minutes or until crust bubbles and is well marked. Reduce grill heat to low; turn dough over. Arrange onion mixture over crust; sprinkle evenly with cheese. Cover and grill over low heat 3 1/2 minutes or until cheese melts; remove pizza from grill. Sprinkle with oregano and black pepper.