Green Gumbo

Ingredients

• ["4 ears corn, shucked", "6 cups water", "1/4 cup extra-virgin olive oil", "1/2 medium yellow onion, small dice (1 cup)", "1/2 medium green bell pepper, small dice (3/4 cup)", "1/2 stalk celery, small dice (1/2 cup)", "2 large cloves garlic, thinly sliced", "Kosher salt", "3 cups vegetable stock", "1/4 cup tomato puree", "1 teaspoon Cajun spice mix", "1/2 teaspoon freshly ground black pepper", "1/4 teaspoon dried thyme", "One 8-ounce bunch collard greens, ribs removed and thinly sliced (5 packed cups)", "4 ounces spinach leaves, thick stems removed and leaves torn if large (2 packed cups)", "4 ounces mustard greens, thinly sliced (2 1/2 packed cups)", "4 ounces green cabbage, thinly shredded (2 packed cups)", "2 ounces curly kale, ribs removed and thinly sliced (2 packed cups)", "1/2 jalapeno, stemmed, seeded, and finely chopped", "4 ounces okra, trimmed and cut into 1/2\" rings (1 1/2 cups)""