Empanadas de Rajas Con Crema

Name: Empanadas de Rajas Con Crema
Ingredients: 1/2 pound (226 grams) fresh medium ground corn masa, or fine masa harina; Flaky sea salt, to taste; 4 large poblano peppers; 2 tablespoons unsalted butter; 1 small white onion, thinly sliced; 1 garlic clove, thinly sliced; 1/2 cup whole milk; 2/3 cup crema, crème fraîche, or sour cream, plus more for serving; 3 cups vegetable oil, for frying; Pico de gallo, for serving; Queso fresco, crumbled, for serving