Easy Cheesey Corn and Shrimp Tamales

Name: Easy Cheesey Corn and Shrimp Tamales
Ingredients: 1 ounce red onion, finely diced; 1 tablespoon red wine vinegar; 2 ears of corn, husks still completely intact; 1 poblano pepper, roasted, skins and seeds removed; 1 tablespoon chopped cilantro; 1 ounce grated Cojita cheese; 1 1/2 ounces grated Monterey Jack cheese, plus more for topping on the shrimp; 1 teaspoon freshly squeezed lime juice; 1 tablespoon unsalted butter; 6 shrimp, peeled and deveined with tails still attached; salt and pepper to taste