1-½ lbs.ground chuck (I use 78% - 84%, which indicates the amount of lean meat-to-fat ratio. You can find the percentage on the package label)
25saltine crackers (about ½ sleeve), crushed
1/3 cuponion, finely chopped
2 tbspolive oil
1 large or extra largeegg, slightly beaten
1 tbspWorcestershire sauce
1/3 cupketchup
2 tspyellow mustard
1 to 1-½ tspsalt (depending on taste)
1/2 tsppepper
Topping:
1/3 cupketchup
1 tbspplain yellow mustard
2 tbsplight brown sugar