|Plain non fat yogurt||3 Tablespoon|
|Reduced calorie mayonnaise||1 Tablespoon|
|Prepared mustard||1⁄2 Teaspoon|
|Lean ground lamb||1 Pound|
|Garlic powder||1⁄2 Teaspoon|
|Dried oregano||1⁄2 Teaspoon|
|Worcestershire sauce||1 Tablespoon|
|Onion rolls||2 , split and toasted|
Combine yogurt, mayonnaise, mustard, and paprika in a small bowl; stir well.
Cover and chill at least 2 hours.
Combine lamb and next 5 ingredients, stirring well.
Shape lamb mixture into 4 (1/4-inch-thick) parties.
Place parties on rack of a broiler pan that has been coated with cooking spray.
Broil 3 inches from heat 3 to 4 minutes on each side or to desired degree of doneness.
Drain parties on paper towels.
Place a lettuce leaf, tomato slice, and lamb party on each bun half.
Top each party with 1 tablespoon yogurt mixrute.