1. Cook rice according to package directions, omitting salt and fat; set aside.
2. Place tofu between paper towels until barely moist; cut into 1/2-inch cubes. Combine tofu, 1 tablespoon cornstarch, and shrimp. Combine remaining cornstarch, broth, and next 4 ingredients (through chile paste); set aside.
3. Heat sesame oil in a large nonstick skillet over medium-high heat. Add shrimp mixture to pan; sauté 3 minutes. Place shrimp mixture in a bowl. Heat canola oil in pan over medium-high heat. Add onion, bell pepper, ginger, and pineapple to pan; sauté 2 minutes. Add shrimp mixture; cook 1 minute. Add broth mixture to pan; cook 1 minute. Serve over rice.