Ingredients Servings: 4 ¼ red onion, thinly sliced Kosher salt ¼ head of savoy cabbage, cored, thinly sliced 3 tablespoons white wine vinegar 4 tablespoons (or more) olive oil, divided Freshly ground black pepper 4 skinless, boneless chicken thighs ¼ cup cornstarch 2 large eggs 2 tablespoons Dijon mustard 1 teaspoon cayenne pepper 2 cups…