1/2 c. olive oil
1 egg
1 clove garlic
1/2 tsp. dry mustard
1 tsp. lime juice
1/2 tsp. Worcestershire sauce
1/2 c. grated Parmesan cheese

Whirl first 6 ingredients in blender. While blending, add Parmesan cheese and whirl for 5 more seconds. Toss with Romaine immediately.