Vegan Gumbo

1 medium onion, chopped
1 medium green bell pepper, diced
1 stalk celery, chopped
2 cups okra, sliced (fresh or frozen)
Salt and pepper to taste
1 can Italian-flavored crushed tomatoes
1 teaspoon garlic powder
Dash Tabasco sauce
1 cup whole kernel corn, fresh or frozen

Saut