Easy Ham and Cheese Appetizer Sandwiches

Details

Ingredients

• 1 cup butter, softened
• 3 tablespoons poppy seeds
• 1 onion, grated
• 1 tablespoon Worcestershire sauce
• 2 tablespoons prepared Dijon-style mustard
• 2 (12 ounce) packages white party rolls
• ½ pound chopped cooked ham
• 5 ounces shredded Swiss cheese