Dutch Lettuce

Ingredients (12)

• 1 egg yolk, beaten
• 2 tbsp sugar
• 2 tbsp cider vinegar 
• 1 tbsp butter
• 1 tbsp flour
• 2 tbsp water
• 6 strips bacon cooked but not hardened, cut into small pieces
• 3 tbsp cider vinegar
• 3 tbsp water
• 5 cups coarsely chopped lettuce (a crisp lettuce is preferred: iceberg or romaine)
• 1/2 cup chopped sweet onion
• 4 hard-cooked eggs, sliced