Servings: 4

Beef: subheading: Beef:
1 lb lean ground beef (90%) 1 lb lean ground beef (90%)
1 tbsp Worcestershire sauce 1 tbsp Worcestershire sauce
1 tbsp ketchup 1 tbsp ketchup
1 tsp salt 1 tsp salt
Pepper Pepper
 
Onion: subheading: Onion:
2 onions 2 onions
1 tbsp balsamic vinegar 1 tbsp balsamic vinegar
1 tbsp sugar 1 tbsp sugar
Butter Butter
 
Bread: subheading: Bread:
16 slices 16 slices

Add meat to bowl and mix with ingredients.
Split in two 1-gallon plastic bags, roll the meat flat in the bags and freeze for 30 minutes.
Cut each bag content into quarters, and bake on baking sheet at 400°F for 10 minutes in convection oven.
Cut and slice onions thinly. Add butter and saute onions for a few minutes. Add balsamic vinegar and sugar.
Add beef to toast bread. Lay onions on top. Add another slice of toast bread and use i.e. Panini press to finish them off for a few minutes.

If you like to add additional ketchup, you can add it to the onions on the toast bread.  If you like to add additional ketchup, you can add it to the onions on the toast bread.