Step 1Sprinkle octopus with salt to taste and rub on for about a minute. Rinse in cold water. Drain. Repeat. Pat dry with paper towels.
Step 2Combine onion, bell pepper, garlic, soy sauce, oil, chile powder and pepper in bowl. Coat octopus generously with seasoning.
Step 3Grill over medium-high heat, moving around grill so octopus cooks evenly, 3 to 4 minutes.