Broiled London Broil With Purple Plum Sauce
["2 lb. London broil", "2 Tbsp. red wine vinegar", "3 Tbsp. cooking oil", "1/2 tsp. crumbled oregano", "1/4 tsp. dry mustard", "1/4 tsp. each: salt and coarsely ground pepper", "1 lb. can purple plums", "1 Tbsp. light brown sugar", "1 Tbsp. lemon juice", "1/2-inch fresh ginger"]
["Score the steak quite deeply with a sharp knife all the way down its length on the diagonal, about every 1/2-inch.", "Turn steak around and repeat, scoring in opposite direction, so score marks become little squares."]
["broil", "red wine vinegar", "cooking oil", "oregano", "dry mustard", "salt", "purple plums", "light brown sugar", "lemon juice", "ginger"]