Prep Time: 20 mins / Cook Time: 10 mins / Total Time: 30 mins 12 servings / 24 sandwiches Ingredients 1/2 cup (1 stick) unsalted butter, softened 1/2 small yellow onion, finely chopped (1/4 cup) or 2 tablespoons dried minced onion 1 tablespoon poppy seeds, optional 1 tablespoon Dijon mustard 1 teaspoon Worcestershire sauce 1/2 […]