Vegan Rib Sandwich with Street Corn

Name: Vegan Rib Sandwich with Street Corn
Cuisine: American
Ingredients: 1 8-ounce packet tempeh; ¼ cup low-sodium tamari or soy sauce; ¼ cup ketchup; 3 tablespoons Dijon mustard; 1 tablespoon plus 1 teaspoon maple syrup; 1 teaspoon onion powder; Freshly ground black pepper to taste; 2 cups frozen or fresh sweet corn kernels; ½ teaspoon chili powder; Juice of one-half lime; 4 hotdog buns; 2 tablespoons chopped cilantro; 1/3 cup crumbled vegan feta; 3 tablespoons vegan mayonnaise; 2 teaspoons sriracha; Fresh lime juice to taste; Salt to taste